Irving. Whatever Cleveland achieves now, is strictly Irving and him carrying a team all by himself is gonna make him better. Rubio is good too, but got better players on his team
I said PG rarely lead teams to championships, whether pass-first PGs or scoring PGs. You need to build around a big man or an elite wing player, at least that seems to be the popular winning formula.
And among those 4 PGs, there is 1 championship. And Kidd only won that because he happened to get on the right team in the twilight of his career. Again PGs don't win championships.
Did I mention championships? We are talking about picking one out of these 2 players here, dont get too carried away.
I went with Rubio. His skillset is much more rare than Irving's. It is really tough to find a PG to do the things he can do. Shooting will come in a few years.