What will sell better, Splatoon 2 or Mario Odyssey?

[JWeinCom]

Wyrdness said:

JWeinCom said:
Switch seems to have reached more outside Nintendo's core fanbase than Wii U. A more casual fanbase will favor Mario more than Splatoon.

Disagree it's more the opposite imo Splatoon is a fun shooter casuals can pick up in the same way Mario Kart is a racer they can pick up as well as Smash being a fighting game they can get into. Mario may have appeal to the casuals but the 3D platform games are more something for avid players if anything where as the former mentioned titles have added factors that give them 

Why can people pick up Splatoon and have fun, and not pick up Mario and have fun?  The Mario games are not especially complex (less so than Splatoon), and sales have shown that they have very broad appeal.