I'm not a Webster fan (that is to say, I'd love for him to succeed, but at this point I am dubious that he'll be anything more than a reserve level player). I like Outlaw's burst-scoring ability, but that's best utilized as a bench weapon. A Vinny the Microwave type.
So, it's Batum as the starter next year, to me. He's already decent. With another month-plus of regular season/playoff play and an off-season to get stronger and work on weaknesses, I think he'll be more than solid next year.
I'd love to be able to deal Webster (perhaps as part of a package) for a decent young point guard. Like maybe try to tempt Milwaukee into a sign-and-trade for Sessions. I think the optimal arrangement going forward is Batum as the starter and Outlaw off the bench. No real role for Webster.