Hello! I really like Sonic Rush because it introduced Blaze the Cat. She has a unique design, a strong personality, and her gameplay feels fresh compared to other Sonic characters.
I also enjoyed Sonic Advance 2 on the GBA, especially because of Cream the Rabbit. She’s cute, has a fun playstyle, and using Cheese the Chao in battles makes her really special.
Edit: The first 3D Sonic game I ever played was Sonic Heroes on the PS2. It’s a fond childhood memory for me, especially playing with Sonic’s team and Amy Rose’s team.