difference between builds?

Imo, axes are the best if you want pvp and pve. If you want to use all weapon paths and just learn how to use em all, go with the classic 3 str 2 dex build. This allows you to use axes and fists, then you can pick and choose which skills to learn/level. Each weapon has it's advantages and disadvantages for pvp and pve, though. I used Lyndura's guide when I started my BM, though, and she mapped out all the pro's and con's to each weapon path.

I don't regret using fists as my main weapon starting at level 1. Axes didn't really come in handy till level 85 when I needed for FCC and continue to use axes about 10% of the time, fists about 85% of the time.

Axe builds tend to give you sickenly low damage output unless you take the time to gather mobs into zhen groups. This isn't usually possible in BHs working with others. The mana consumption is extremely high, too, making it an expensive path. When I work with other BMs using axes they remind of of barbs with lower vit and lower dmg output because we don't have a barbs skill set. Fissures slow ability is useful in squads, as well as stuns, but don't expect to be seen as a DDer or tank.

My vote goes to fists. You can DD with the best of them, you kill things faster so your dmg taken is much less and cheaper repairs. Your lack of hp makes you vulnerable to chunks of your hp bar disappearing but mobs don't last as long in front of you. You use less skills so you can save money on skill path and mana pots. You will be able to tank BHs at your own level, and you will be seen as a DDer. Carry axes to switch back and forth for when the situation calls for it.