Weapon Types

Guys, are there prefered Weapon types for each class?
Like why was every Ret Pala in S1 with the Axe and not with the craftet sword, the stats are identically?
Looking at S2 now, for Fury M+ BiS are 2 Polearms with Haste+Mast, but there is also a Sword and a Hammer with Haste+Mast.
Is there any reason for it?