I've said this a couple of times before here but I just don't think the Jazz' system benefits Ricky all that much. It puts him in a lot of situations which magnify his weaknesses (e.g. shooting, finishing at the rim although to his credit he was pretty good at the rim in this series) and doesn't really allow him to maximise his strengths as much.
Exum I think benefits the Jazz more in a perfect world because his ability to get to the rim in 1 dribble anytime he wants without being a reliable outside threat just opens up so many things for the Jazz, but Rubio is definitely the steadier presence in reality.