For PS2 maybe look into the Retroid Pocket 4? I would say RP5 but it's more expensive. I'm sure there are compromises but I remember the hype on it being what felt like the first real step into playing PS2/GC on a non phone/SD device.
Might end up having to be at native/1.5 resolution and frame skipping on and all that but it -apparently- works OK, I can't personally vouch for it though.(If I sound like I don't trust it it's because I feel like I have different standards on what is considered playable to most people I see talk about this)
If all the hype was true this does mean RP5 is probably the best alternative to the Odin 2 Mini, more brute force power in that chip.
Found the Miyoo look alike, it's called the R33S 
Imitation is the most sincere form of flattery they say! I legit can barely tell a difference lol
Kids on the streets are saying it's all about the sturdy Trimui Brick though
Oh damn, I really thought that was some version of jelos 
I forgot what it's called but there was also another Miyoo clone that looked SUPER similar. The only Miyoo I'd want is the smaller original, but I'll confess I'm a bit apprehensive about aliexpress, I know it's a legitsite but some of the stuff on there looks so dodgy man.
https://powkiddy.com/en-uk/products/powkiddy-rgb10s-3-5-inch-4-3-ips-oga-screen-open-source-handheld-game-console-special-back-button-childrens-gifts
Yeah pretty much, not really a reason to get other than curiousity, then again I don't really feel the need to buy Powkiddy things either and they're legit, there was the RGB30 for that certain screen aspect (I don't have a handheld emulation device with it…yes I know I'm just making flimsy excuses to buy these things now lol) but then Anbernic made the Cube and the Cube XX andnnnnnnnd poor Powkiddy tbh (and the ZPG Unicorn tbh)
Though having an Analog Pocket has killed my drive for that aspect ratio now, and I get to use actual carts! I'm going to bit the bullet one of these days and buy the rip off price for the Fire Red/Leaf Green carts at CEX and report back if it's fake! :)
I'm not completely sure but that looks like the jelOS ('just enough linux operating system' or something like that, so its er, linux) OS and that thing looks like a knock off Powkiddy product and that's usually what they come with I believe.
AFAIK only the Miyoo has Onion OS, for some reason not teven the Miyoo A30 got it (yet, but doubtful ever tbh)
Alastor