They're kind of their own thing, but they're closer a bit to 2D Mario games.
2D Mario Games
Linear 3D Mario Games: Super Mario 3D Land, Super Mario 3D World
Semi-Linear 3D Mario Games: Super Mario Galaxy 1&2
Exploratory 3D Mario: Super Mario 64, Super Mario Sunshine, Super Mario Odyssey
Most times I lump the Galaxy games with the most open 3D Mario games, but I can understand why they are a different category. I just don't get lumping 3D Land and 3D World with Galaxy and the most open 3D Marios.
Lifetime Sales Predictions
Switch: 144 million (was 73, then 96, then 113 million, then 125 million)
PS5: 105 million Xbox Series S/X: 60 million
PS4: 120 mil (was 100 then 130 million, then 122 million) Xbox One: 51 mil (was 50 then 55 mil)
3DS: 75.5 mil (was 73, then 77 million)
"Let go your earthly tether, enter the void, empty and become wind." - Guru Laghima