It is extremely hard to do both as far as I am concerned the best spec for this is fury prot. You can get flurry and 1 hand weapon spec so you have decent agro and the early prot tree which helps alot in pve, even if you dont get shield slam. That and concussion blow is really nice for pvp.
You can probably work a spec out to your liking but thats what I would shoot for if I wanted to pve and pvp. As far as gear goes the same rules to tanking and being fury apply if you are BG'ing or Tanking.
Keep in mind this applies to tanking / pvp. For dps as fury in raids its really all dependant on gear, your damage doesnt really scale well unless you have better gear so it all depends on what you are looking to do. In raids your dps is not nearly as good being arms anymore since the Windfury nerf but its probably comparable to being fury with bad gear.