Based on this, 3D Mario games are objectively better since the 3D Sonic and Crash games are generally worse.It's hard for me to say, as I adored SMB2, SM64DS, NSMBWii and SM3DW for their own reasons. Generally though, the 3D Mario platformers are pretty unmatched in terms of overall quality (like the closest biggest competitors are Crash and Sonic, though the latter case has inconsistent quality), the 2D Mario platformers on the other hand have plenty of competition (Kirby, Rayman, Donkey Kong) and dare I say have overall better games than them.