Double axe: machine gun whirlwinds
Paladin sword: shotgun whirlwinds
The paladin sword has a 2 secs delay, which takes forever. It is good in some situations, e.g. when you are swarmed by a lot of non-casting not-life threatening mobs with high hps. If there are a lot of casters or hard hitting mobs around you, you cannot leech life back fast enough.
That having said, you can use it in the first two or three waves of the easy champ spawns. It only costs 50 turn-in points and you can powder it back to full durability, so why not get it.