Deploying a Victorinox usually means using two hands and then not having a solid lock on the deployed blade. Putting the knife back is also a two handed gesture. While the blade has a stop around halfway to retracted there is still some risk involved. The Manix uses a Spyderco specific variation of a slider lock mechanism which allows the blade to be easily deployed using a range of fast flick or slow slide gestures that require only one hand. When the Manix blade is deployed and the slider lock is not manually held open it automatically locks solidly so that the blade does not move against the handle and the strength of the lock is such that the handle is more likely to fail than the lock itself. Retracting the Manix blade is as simple as pulling back on the slide and then letting the blade fall or swing back into place and while some prefer to use two hands it is easy and even fun to deploy and retract the Manix with one hand.
When it comes to cutting there are many variables and the most important is the geometry of the blade. The broad flat grind of the Manix and the classic shape of the cutting edge make it easy to use for piercing and cutting action that slices instead of chopping. Superior materials mean that under use almost any of the Manix blade variants will hold an edge far longer than the Victorinox.
So whether simply carrying the knife around just in case it is needed, deploying it for use, or actually cutting things the Manix is going to deliver easer and more reliable performance. It may be just a knife, but if you often use a knife then the convenience can quickly pile up to being less than a dollar--even pennies per actual use with each. And every time you can have the satisfaction of doing what needs to be done with minimal inconvenience. And it is also just plain fun: A fidgety machine that looks cool and works well can inspire confidence in the modern world the way so many other widgets can turn promise into a drag.
Depending on the country (and possibly in the US depending on states) a folding knife that can be opened with a flick of the hand/wrist may be considered illegal (switchblade or more accurately "gravity knife").
See:
https://www.akti.org/news/california-appellate-upholds-653k/
In some places there are also contrasting theories on the legality of the "lock open", i.e. a Victorinox multitool or an old Leatherman without lock would "pass" but a (say) Leatherman Charge/Wave/Surge would be border line[1] or just over the border[2].
[1] if considered "multitool"
[2] if considered "knife"
I guess it really depends on what you care about.
If you have the Victorinox mostly for the tools, then it's obviously better than the Spyderco. If you have it mostly for the blade, then the Spyderco will be better. The edge will be sharper and will last longer. Also, the lock is more ergonomic and probably stronger.
If you really like the Victorinox and don't care that much about the cork screw, a Leatherman wave/charge just has much better tools and blade than Victorinox, and you can get the blade in s30v for a bit better performance.
I see it as a category thing; a multitool has a knife, but is not a pocket knife. It is fine for cutting things in a pinch, but is terrible for much use - the ergonomics are all wrong, it is heavy and awkwardly shaped, and usually the blade shape is going to be very generic.
As far as cost, it is like anything else - you pay for quality. Others have covered this, I don't have anything to add, other than a rule of thumb - if you've never sharpened a knife, you will probably not find much value in nice ones.
As far as value, that's up to you. I use a knife daily, some days more than anything else I carry with me. If you don't need one, then it will be worth far less to you.
edit: when you've got the nubs pulled back, you have to give it a little shake shift the blade a little.
Note that it has a locking blade, which makes it illegal in the UK, even though the length is under the limit.
A knife is a personal tool; Often what you're paying for is not just the blade quality, but also the ergonomics. For example, my dad has one that he really likes, but I dislike the blade shape, and there's another one I have that is just horribly shaped and feels terrible in the hand.
https://www.gpknives.com/victorinox-money-clip-red.html
i also have a victorinox Fieldmaster multi-tool, but the knife in it does not get a lot of use since i cannot EDC the thing due to its heft. i've used the saw in it multiple times and that thing is fantastic.
>> i cannot EDC the thing due to its heft
Ha ha! I EDC'd a WorkChamp for a long time. Super handy. Not that comfortable!
i don't use it for cash, either. but it's extremely thin and is comfortable in the jeans front mini-pocket. much lower profile and no cheap plastic compared to their standard keychain knife:
https://www.rei.com/product/403028/swiss-army-classic-knife
the clip portion of it goes high enough on the frame where you could use it as a pocket clip, with ~0.3" protruding upwards.
You can buy a Victorinox Swiss Army knife (SAK) in exactly one blade steel and it's a stainless steel that's extremely soft, relatively speaking. That's actually a good thing for most casual users since it's fast and easy to sharpen, resilient to abuse, and being stainless, easy to maintain. However, it will not stand up to a lot of normal usage before the edge dulls and it just doesn't perform well anymore.
By contrast, the Manix's base model uses S30V and you'll probably get three or four times as much use from it before it dulls. Spyderco is also a "knife enthusiast's knife company" and they make a lot of their knives available in other varieties of steel too. One variant is Maxamet (a tool steel uses to cut other metals) and you'd easily have an edge on that variant last probably 10 times longer than a Swiss Army knife, but at the cost of having a more brittle edge that is much more difficult to sharpen and it's not a truly stainless steel either, so you have to be mindful of rust and exposure. If you're in a job position where you use it a lot, like in a warehouse where you cut pallet straps and break down boxes constantly, the steel variant choice can easily be the difference between needing to touch up the edge every single day vs. once a week. Spyderco also makes an entire lineup of knives that can withstand saltwater exposure without needing constant maintenance, something that would render a Swiss Army knife useless quickly. Those attributes mean the cost difference can be just about anything if the real world choice is between "useless hunk of rust" and "usable".
There are also economies of scale. Victorinox sells a lot more SAKs than Spyderco sells Manixes, they stamp out their blades by the thousands, if not millions. Spyderco probably doesn't make more than 100k Manix knives a year. A single Manix also has about as much steel in it as 2 or 3 SAKs (the blade is two or three times thicker at the spine), the handle material is nicer and more expensive, the construction is maintainable, the lock is stronger and more intricate. Also there's a machining cost difference, you don't stamp out thick blade blanks of high end steels, you have to cut them out of a billet. Grinder belts are a consumable that are used to sharpen a knife and they last a lot longer for soft steels vs. hard steels. That cost as well as the additional time an employee spends on it goes into the knife's cost. Spyderco's Manix is made in Golden Colorado, which also has a high cost of living and afaik they compensate their employees with a livable wage (I've been to their factory outlet several years in a row and keep seeing the same faces).
All that said, knives can also be pocket jewelry and there's a whole world of stupidly expensive knives out there that enthusiasts push up the prices of, just like there's stupidly expensive cars, watches, keyboards, shaving razors, dress shoes, sneakers, streetwear, raw denim, etc, etc. You can easily reframe your question as to why a pair of Japanese raw denim jeans costs way more than twice as much as a pair of Wranglers at WalMart, given that they're just pants. Or why a Lamborgini costs more than a Civic, given that they're just cars, or why a Keycult keyboard resales second hand for $4k when you can buy a Dell OEM keyboard for $15.