#18 The arc makes it a little bit too generic. Does not impact in mind. #15 Nice division of terms. Like the gold color and combination of caps. it gets a bit confusing at the end od the word clan. I really do not know what it means and it feels a bit too full of things. #16 Nice colors also, but to heavy on the right.
All of them may be missing a simple differentiating thing. Maybe #18 has it but is not so differentiating.