It sounds dumb but my pick would be the SNES. There’s just something about 16 bit games I love.
The SNES has so many good games, like sf2. The first party games and some good arcade ports.
It also has a lot of good RPGs, like chrono trigger
The controller is really cute
Tho, the PSP is a close second. Tekken dr running at 3x resolution looks beautiful
Yes I’m a sucker for dpad centric devices. Yes i love emulation.
16 bit stuff looks amazing
PSP, followed by Gameboy Color, followed by Advance SP.
I recently got a Retroid4, and took an amazing trip down memory lane with Mana Khemia, MG:AC!D, FF Tactics Advanced/A2, Monster Hunter Freedom Unite, and a bunch of pkmn ROM hacks. All of them easily held up today.
Unless SteamDeck counts, in which case it wins hands-down.
I has the 4 pro. PSP is a good system