Stormwarden might do the most DPR, but that doesn't necessarily make it the best.
In my opinion, Battlefield Archer is the strongest Ranger Paragon Path. Actually, Pathfinder is pretty good too if you ask me. Stormwarden is the clear master of DPR, though, and maybe the "default" ranger path. (Well, i think Pit Fighter does even more damage...)
If you don't take an archery Ranger Paragon Path i think you want twf style even if you're an archer.