Ooh ooh ooh, I like this question :D
Obvious follow-up question is whether we’re talking about classic or modern. I’ll give one of each.
For classic Sonic, I like City Escape the best. Hitting those jumps in the skateboard section and seeing him fly around is so cool. I also like how the speedy-shoe sprint at the end shows off how quick you can go, even though classic Sonic can feel kinda slow and plodding sometimes. The GUN truck nips at modern Sonic’s heels, but it has no chance of catching classic Sonic.
For modern Sonic, my fav is prolly Green Hill. Yeah it’s stupid easy cuz it’s the first level, but it gives you a lot of room to play around with Sonic’s skills without dying a bunch of times. Plus, the scenery and the bright colors just stun me every time.
I’m not sure if I could pick one over the other, but… Maybe I like classic City Escape just a bit more.
I remembered i like City Escape and Crisis City. And also rooftop run act 1. Can’t remember why though, it’s been years 🤔
I’n gonna tell you right now: nothing is ever gonna top Speed Highway Act 2 (Modern).
This is easily the best level in the entire Sonic campaign. The sense of speed is truly strong here, and it the best layout of any level from Sonic Generations. But, the part that really makes this level stand out from the rest of the levels in the game is the highway segment where you have to “drift” Sonic down the highway. Not only is it a great mechanic for the level in general, but it also literally sounds like car from an anime drifting when you drift Sonic. It’s Initial D but in Sonic form.
This level is just incredible. Easily the best level of the whole Sonic campaign, bar none.
That one’s up there for me too, but you must be way better at drifting than I am. Whenever I feel like I’m finally getting the hang of it, I hit a car.
