I tried barb with quite some good gears. I was really really surprised to how much fragile it is. I got destroyed in 70's while I passed a 76 with my DH.
It's not because someone passed a X GR with a given class that you will pass a (X-5) easily with the same build. When I think about Wudijo's 88 and his build, not everyone can play this, and certainly not me.
Same goes for IK+raekor barb in my opinion.
I don't know for WD though, I almost never played it. My advice would be, try some build and you'll see where your preference goes.
If you're only interested in performance, take the most efficient build (crusader it seems) and try hard a lot. But you might be disappointed by the outcome anyway.