This thread is a bit meaningless. Neither Collier, nor Clayton is a starting-level PG in the league at the moment and both of them are pretty unlikely to improve enough to become a quality starter. they could probably become solid backups but the competition to become a backup is very different from competing for a long-term starting position. Personality, locker room presence, ability to stick closely to what coaches want them to do, their fit with the second unit and many other things like that become the deciding factors.
The Jazz will probably keep and develop both of them, bring the actual starting PG and then decide who they should keep between Collier and Clayton as a backup (if any).