I think both have their own merits! 2D will always have a special place in my heart for that nostalgic, beautiful anime look. However, 3D games offer a whole new level of immersion and interaction that 2D just can't match. At the end of the day, I definitely prefer 2D.
I don't mind 3D, but I've always liked 2D better, not just in games, but in movies too. I guess I'm a little old-fashioned? lol (3D games also take up way more space, and I don't think it's worth it)