Aoki is an incredible jui jitsu fighter with possibly the best defensive guard in his weight class. Uno is a wrestler with good submissions.
Neither has knockout power really.
Both guys have issues with strikers. This will come down to wrestling and submissions.
Uno will likely get the takedown and work from Aoki's dangerous guard. He's not going to submit or knock out Aoki put if he's careful in that top position he has a chance.
Uno only loses when he gets knocked out or can't get the guy down which won't be an issue with Aoki who may prefer to be on the bottom, using his rubber guard.
With the odds the way they are, Uno is the choice. He is going to be in alot of dangerous spots but he's very hard to submit and can win on the cards.