The main question you need to ask yourself is what do you prefer to play.
- The numbers are only there to illustrate my points -
- A Tal Rasha in 2.5mins, or a GoD in 2mins?
- With what class do you plan to push, and therefore have a chance of having better items (via loot)?
I know that at the same level, my WD takes me more than 30 seconds longer than a DH GoD.
But I prefer the WD gameplay (Surprising? Not really) and I plan to push with it.
So I know that I will more easily do speed GR with the WD rather than with the DH, which will quickly tire me (Even if the GoD is funny)
Not sure to be clear 