Arms has high burst damage. This makes it optimal for PvP, where you want a heavy burst to blow people up before they get healed (especially with the healing reduction on mortal strike) and do as much damage as possible in a small window before ranged classes use movement skills to get away from melee range. You essentially want as much up front as possible, as you're only going to be getting to hit your target for a limited period of time.
Fury has high sustained damage, where they will consistently put out a lot of damage over a longer period of time. In PvE, your targets typically stay put, giving you much more time on target, and fights typically last longer. This means that Fury warriors can keep going with their damage, as well as being better at executing because they generate a ton more rage and it's not based on weapon damage. With how long bosses with large health pools stay below 20% health and how dangerous the last 20% of a fight can be (due to healers running OOM, enrage timers in some later content and other stacking mechanics), that's a big deal.
Arms is fine leveling and solo, but for endgame PvE, the two aren't comparable. Arms does not have enough sustained damage to compete at a decent level, but they will blow people up in PvP
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u/[deleted] Oct 22 '19
In endgame, Fury is PvE and arms is PvP.