Assuming that Rubio enters and is able to work out his buyout. And, assuming Wall doesn't change his mind and gets the ok to enter the draft.
I'll take the #1 pick and let GP & the new coach decide who would be better in the offense & defense that they want to run.
But, if the choice were mine, I'd take Griffin #1. Anyone we have talked about here that we would like as our third big (Bosh, Amare, Boozer, Milsap, ect..), we're talking major $'s. Where as, there are many PG's in the draft, FA's, or trades, that might fill the starting PG just as well as Rubio. Unless we're going to run a strickly Playmaking PG offense, Rubio might not be the best PG for us.