It's a tubular collection, dude.
Sega has done a lot of great things with emulation as of late. On the 3DS, they released 3D remasters of a handful of games, which boasted a handful of improvements to the source material. Their Sega Ages line marks another batch of games that are seeing improvements to the original games as they release on the Switch. However, Sega Genesis Classics is more of a compilation of classic Genesis games with some additional features that make it a great collection to have on your Switch if you grew up with these old games.