I like Sonic 1 and Sonic 2 more than Sonic 3/& Knuckles.
I’ve only ever played Colors and a bit Sonic 1 on mobile, lol.
The former had a killer soundtrack, though. I should give Unleashed a try, but I’ve never felt the drive since to actively go through the trouble of playing a Sonic game. Not my thing, I guess? I mean, I enjoyed Colors, but I guess not enough to seek out more.
I don’t like Colors or Unleashed. Or Generations, or really hardly anything released in the past fifteen years.
1, 2, 3&K, CD, and Adventure 1 are the greats IMO. Adventure 2 is good, but not as good as its predecessor, and Heroes is a mixed bag. I guess I like Riders. Mania is weird because it’s great, but it also feels strangely mediocre for me. Part of it is definitely the lack of originality (only four are entirely new stages, while the rest are re-imaginings of old ones).