Arms will definitely beat Fury at lower levels for a couple of reasons:

1. Overpower is really cheap. The main strike for Arms warriors which will almost always be up even at lower levels, it's never not available. This is not true with BT and WW for lower geared Fury warriors.

2. Charge without having to stance dance. Fury has intercept which uses rage, charge generates rage, and arms warriors are never stance dancing (and therefor potentially losing rage).

3. 10% passive arpen from Battle stance is really a much bigger boost at those gear levels than the strength bonus of 'zerker stance, especially if you have something like the Incisor fragment from drak'tharon keep.

4. Assuming you are still in quest/lower level blues, the 1 weapon from Ampitheater of Anguish will be much better for arms than a fury warrior who is using it in conjunction with another more crappier 2h'er.

I'm currently leveling my warrior fury... simply because just like Rossi, I am freakin in super heart love with Titan's Grip. I don't care that it's inferior, because it's really just a lot more fun to level that way. In the same respect, WW still does pretty darn good damage on dungeon packs even with really crappy gear.