This year would be Sonic's 30th anniversary since his first release in 91', and we have been there for the highs and lows. Every five-ten years we would get games and other stuff that celebrate said milestone, which anniversary game/comic/etc is your favorite?  

my fave is SA2 and Sonic Mania, representing the 10th and 25th respectively. The former because it has gotten me into Sonic and had very fond memories and the latter because it was made with love and appreciation.

10th by far. 25th was good too. Not even sure what they did on the 20th though. Sonic Adventure 2 was the best way to celebrate 10 years in gaming and a great send off to the Dreamcast and Sega hardware in general.

Wasn't Sonic Generations the 20th anniversary game? its pretty good

I would probably go with Sonic Mania with the 25th anniversary and Sonic Generations for the 20th. Now, I'm not sure if Sonic Mega Collection was part of any anniversary but if it isn't, I'm choosing those two.

I didn't realize Sonic Generations was the 20th anniversary game. I thought it was 2010 but I was thinking of colors. Hmmm well it's a close tie between that at SA2 imo. Hopefully the 30th anniversary can at least keep up with that 20th and 25th.