Lots of “old” games i don’t like. But Retro implies Popular, so that narrows it down for me.
If I was to choose, it would be the genera of 3D Collectathons during the N64 and PS1 era. I don’t like the idea of being given a game with no direction and be told find your own fun. The N64 was filled with these games, like Mario 64, and Banjo Kazooie, the PS1 would be like Crash.
The exception to this rule was Spyro which gave the worlds a bit of a story after the first game. Enough to know what to do in a world, so when you stumble into the side distraction you can play them if you want. At times even those have stories.