Smash

Let's go with 20 million.
Will be bigger than the 2019 mainline pokemon.

Hot take.

I think Pokemon Let's go will sell more in 2018. The mobile users will transition to Let's Go.

Smash. Let's Go will probably do 5 to 10 mil akin to the remakes and third versions. Smash will do 12 to 15 mil or more I think.

Pokemon.
I think this one will do stunningly well with the casual market.

Well look at this logically. Will there be another Smash game for the switch after ultimate? Can never say for sure however the overwhelming odds are no. We already have four (two versions assumed of each game) Pokemon titles confirmed for the Switch and I feel comfortable saying we'll have another 2 to 4 before the life of the Switch is complete.

So because you only have a single choice for one title with absolutely zero internal competition against it, Smash will outsell any Pokemon on the switch.

There should be a poll.

Probably Pokemon 1st year but Smash Bros LT.

It depends how early we get to see gameplay footage of Pokemon 2019. After that Pokemon Let's Go will be dropped like a hot rock.