Storage is also a non-issue as adapters to use SD cards are easy to find for really cheap. PS1 games play much better with the extra analog stick and touch pad, even more so with a grip that adds 'triggers' to the back. Scaling is never an issue since the resolution of the Vita's screen can easily fit a 2x scale fro most consoles and 3x for handhelds. The form factor is obviously a lot bigger but with that comes a much more comfortable grip and way better controls. GBA is much better with only minor incompatibilities and SNES whipe not great is definitely much more playable. The Vita will basically do everything the Go does better. If you can get over those problems though it can still be pretty decent for most stuff and the small form factor plus being able to easily connect it up to a tv and use a Dualshock 3 may make the sacrifices worth it. also, it's the only GBA emulator for PSP that supports zipping 32MB ROMs. You'll also be stuck to only 16GB of storage which can be a pain if you want to play a lot of PS1 or PSP games, there is an adapter to be able to use regular SD cards but it was pretty limited and I'm not sure if they're still being made. (i haven't checked the stickies, just speaking from experience.) it runs games perfectly and supports custom resolution scaling, as well as preset scales (1x 1.5x full screen/stretched). Scaling options for GB/C are also a bit of a pain so unless you want terribly blurry scaling you'll have to use the RIN emulator for it. SNES emulation is pretty poor and GBA isn't great unless you can put up with frameskipping.

The PSP Go can still be an alright enough emulation machine for a lot of stuff but it's definitely aged.

Best gbc emulator for psp