You can't really go wrong with either, both WOA and CLE produce top tier accuracy and most of the top AR platform shooters use either or both of their barrels. If you're still on the fence after hearing what the other guys on this forum have to say you can always talk to these companies, they'll also give you good advice.
As for that CLE chamber...It has a shorter leade and is a bit smaller. With this chamber, mag length ammo doesn't have to "jump" so far before hitting the rifling. If you get your "google-fu" going or use the search feature here on the Hide you can look up what other guys are saying about this chamber...produces awesome accuracy from what I've seen and read. Another alternative is the Wylde chamber. Just depends on what your goals are for your future rifle.