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.