Pokemon, Gran Turismo, OG Ratchet & Clank and endless more possibilities on Steam, what else could a man want?
On a more serious note, Steam version of RetroArch is lacking some features, like having less cores available and not having automatic artwork downloads for your games but the fact that you can have cloud saves and share the same progress across devices not only makes up for it but is a complete game changer. The missing cores and artworks for your games can be downloaded externally and installing them isn't a big deal, having loads of videos on YouTube regarding that.
I truly believe RetroArch is an application everyone (retro-gamers or not) should have in their Steam library.

If you read this, be aware that i invaded a school, murdered all the kids inside and used their corpses to make meat and them i sold them later

I like being able to have all my emulators in one convenient place and use them all more or less seamlessly. I dislike that the standalone version has more capabilities in terms of updates? I would recommend it to anyone who really enjoys games from many different eras and genres