Haven't played all of them, but out of the ones I have, Sa2B was definitely the best. While the Knuckles/Rouge levels are really boring and awful, the shooter stages are easy and quick and the Sonic/Shadow ones are still pretty fun.
The tunes were also kind of awesome in that cheesy sort of way.
Sonic Adventure 2 was the one with the opening that has Sonic jumpin' out of a helicopter and skating down the street, right? I played it on the GC.
I loved the Chao component of that game. They were so adorable! The way they bounced off the pointy rocks and flailed around as they try to swim without drowning. So cute :3
"I love that game because I played it all the time as a kid, but...yeah it's not a very good game, objectively speaking.
It right there in the title! It's 3D and it's a Blast! "
Haven't played a significant amount of it, but I loved what I played of Sonic Colors for the Wii. It felt "right". If you play it, you'll know what I mean.
The good parts of Sonic Adventure 2 were excellent, so I'm picking that. Though the bad parts (Rouge, Tails/Eggman levels, Knuckles's Aquatic Mine stage, all the pyramid levels) are pretty abominable, the good parts were all awesome. And somehow the voice acting in that one never annoyed me.
"It was my favourite. I actually preferred it to the original. I don't have to think the same way you do. And I didn't play Colours.
@SethPhotopoulos said:"Adventure 2 "
I actually don't know why so many people say this. If anything it's aged horribly over the years. "