If you think the Ni No Kuni and Kirby comparison are weird that's nothing compared to Labo vs God of War. I am pretty sure someone already made a thread on that.
Meta critic score: Ni No Kuni
Sales: Kirby?(Ni No Kuni has the advantage of being on two platforms so it will be closer than anyone expects.)
Honestly kirby could do really well. I am thinking like 2.5 million. However kirby sells on legs so this one might take a while to decide who wins.