Maybe this wouldn't matter to a lot of people but the M2 Pro Mini has HDMI 2.1 while the M1 Studio does not. You need HDMI 2.1 to get more than 60hz out of a 4k monitor.

M2 Pro is faster than M1 Max for CPU bounded tasks. When they release the Mac Studio with M2 Max, it'll be faster in GPU department & have 10Gbps ethernet, more ports, probably for the same price.

If you need 32GB in your Mac Mini the price difference is

$1999 for the Mac Studio vs

$1699 for the Mac Mini M2 Pro 32GB.

Indeed that's a tough sell for the Mac Mini. It shows how much Apple is charging extra for those capacity upgrades.

You aren't wrong. The difference between base models if you put 32 GB in the Mini is about $300. But you get 8 more GPU cores in the M1 MAX. And an SD slot.

That's my current dilemma, but now I think I'll just wait for the Studio with M2 Max.

There's a $700 price difference but I'd say it's definitely worth it if you can swing it.