I would support the death penalty in certain cases if our justice system wasn't a total shit show that wrongfully convicts people all the fucking time.
It runs android and comes pretty bare. You have to install your own standalone emulators, set up retroarch, and supply all your own roms. I'm a bit of a tech dork so setting it up was part of the fun for me but if you want it ready to go out of the box this is not the device for you.
I use Daijisho as a front end to browse through all the games and platforms and its been working well for me. I followed the Retro Game Corps video on setting it all up, that guy knows his stuff.
I've been thinking about grabbing a steam deck for a while and I think a lot of those little handhelds would complement it pretty nicely as they're actually pocketable, though your DS might fill that niche for you already. Steam deck for me would be just be chilling on the couch playing games but the rp3+ seems like it's a lot easier to just throw in a bag and go.
I've always been a PC gamer but I just got a retroid pocket 3 plus so I've fallen down the rabbit hole of old console games that I never played. I'm having tons of fun just building a rom collection and seeing what this thing can do. Best $150 I've spent this year, hands down.
Dynamite cop on the Dreamcast is awesome, soulcalibur is possibly the most enjoyable fighter I've ever tried, and all the Mario karts are great stupid fun. I really need to rebind my controls though, Mario kart is killing my thumb lol.
There's also some great android games that are just so cool when played on the TV with a controller like Streets of Rage 4 and TMNT Shredders revenge.