The 17 is my favorite Tweener so far, but I haven't got either the FFG 16 or the 15 yet. Both of them should be arriving in the mail tomorrow.
While I love the clip points, I also understand why everyone seems to want the 16. This is the knife that Ethan spent so many years designing, and it has a mythos surrounding it that makes it the top choice for a first Tweener. The saber-ground 16 was my first Tweener, too. And it is awesome. But one thing it shares with the 17 is that the saber-ground blade isn't as slicy as an FFG blade would be. I think this is one of the biggest reasons why the bushcrafters prefer the 16 to the 17. I'll find out tomorrow if the 16 really is better.
Too old to fight, too fat to run...