Stellar is looking very good for lots of use cases. That's the only one I follow though. What else is good from tech as well as how the coin has been performing?
E.g small coins like sucr or madcoin target specific populations (here south america and maroco). Monero is used by the darknet community. Ripple by the gafas and big financial entities. Ethereum is loved by start ups and geeks. Lightcoin is nice for traders to transfert funds between exhanges cheaper and faster than with btc. Etc.
If you just want to make money however, you target stuff that have a strong chance of going back up in the next month, but is currently very low. Philscurrency is an example of that, with the masternode going from 2.7k to 13k and back to 3k. Having a good rythm and patience is key. But phils has no specific advantages over other coins. It just looks a lot like alqo, and may follow the same path, being now at 23k for one mn. But why does it move that way ? The community on bitcointalk or discord is a big factor.
There are now more than 1300 altcoins, 10% of that only really have something technically unique (having masternodes or dark send is very common nowaday) or a good project (zencash, wagerr, stellar, kryll, etc. are exceptions, not the norm). But because we are in a bubble, most of them are economically very active anyway. So betting on the community is a better metric.
Of course it takes time to get in touch with each of them.
In terms of price stable crypto-currencies there's tether, which is looking very much like a scam, and some kind of complicated ethereum contract token the name of which slips my mind at the moment.
The stellar network is supposed to be able to be used to make payments without necessarily involving stellars (except to fund the transaction). But the anchors and trust web needed to do that don't exist (yet?)