>>714658625
Some pointers:

Buy from chinks, dropshippers will scalp you.
Look for and value negative feedback first and foremost. Youtube reviews are nearly useless. Reddit is just a bunch of gay niggers acting like women about $40 electronics.
Treat each chinkheld individually, brands are completely unreliable.
If it's said to tops at PSP, N64, DC, it can't do those. These systems cannot be played proper under $150 (chink base price).
Always, ALWAYS be skeptical of good d-pad claims. Look for people who play real games and not babby's first five JRPG for feedback.
Charge exclusively with 5v dumb bricks, USB A to C cables, never leave them charging overnight or unattended.
Most of them suffer from audio interference (ie wifi noise), the h700 based line (number/titleXX) as a whole has audio popping on ramp up (boot, loading game, quitting game, etc), if you're autistic about this.
Sticks on verticals are useless. Until triple digits, sticks are cheap generic Switch ones, very mediocre accuracy.

There's only one chinkheld I know I'd recommend in good conscience as a 100% solid build, great buttons, no internal touch up required, pick up and play experience, but it's been discontinued and it's certainly not worth the second hand market prices.

>>714658991
Just about anything can do PS1, might want to avoid Miyoo Mini to get slightly faster fast-forwarding though.
Committing to GBA, the 34xx is pretty solid IF you're willing to tape the d-pad contacts in half, the unconventional button layout won't get in your way and you can live with 3.1" on 4:3 games. Pretty nice screen. Otherwise, anything 4:3 should be a safe bet, albeit some will have washed out screens.

>>714659243
These suck at consolizing, might as well pick up a cheap mini PC.

>>714659832
Micro is too fucking tiny.