Because of the ability to get maximum Weapon Training bonus anytime you take a 5' step, mobile fighter seems like a great choice for a fighter who wants to use a wide variety of weapons - including a melee/ranged switch hitter.
My last character in our Pirate campaign was an Elven Mobile Fighter/Duelist who began duel wielding star knives. It was fun to play even with how little damage the star knives do, not sure how well it work with a bow but that all out attack while moving would be pretty awesome.