Retro Gaming and Emulation

I've recently moved from using my PC to emulate retro games to a R36S (game boy style but with 2 analogue sticks as well) handheld and have fallen in love with having them in a portable device.

I'm looking at purchasing a bigger and much newer and more powerful device so was looking for advice on things like what the pros and cons of some popular devices are, what OS people prefer, what emulators people use, etc. My R36S is running ArkOS which is ok.

I'm thinking a clamshell device would be nice, but a Switch-style would be fine as long as the controls aren't too snug. As close to "full size" analogue sticks would be ideal too, I hate and can't get used to tiny ones like on this R36S or sliders like on the 3DS.

Don't really have a set budget. Would like to be able to emulate up to and including Wii U via Dolphin if possible, but I know that's pushing it. PS2 or DC level would be acceptable too. Alternatively a really good "up to and including PS1" device would be an option.

Some that I've seen that look good:

• Retroid Flip 2

• Anbernic RG556 (I think the 557 isn't getting very good reviews)

• Retroid Pocket 5

• Anbernic RG Arc (because the Megadrive 6 button controller is the GOAT of the 8/16 bit generations.

• Anbernic RG CubeXX