They're pretty much tied, with 3DS having the chance of winning in the end. It won't matter much anyway.
Regarding Pokémon on Switch, I'm confident it will reach 30m again.
Bet with Teeqoz for 2 weeks of avatar and sig control that Super Mario Odyssey would ship more than 7m on its first 2 months. The game shipped 9.07m, so I won