Originally Posted by Shha

As for execute optimization, 2x1h is a bad idea. You lose a lot of stats and damage, and STILL wont get a sure execute spam every GCD.

IF you want to ensure GCD execute spam, what you do is unequip your TG offhand.
Miss rate goes down to 0% if you are already special capped, and look at weapon speed:

3.4 base
speed factors:
1.2 WF
1.03 Ret/Moonkin
1.25 Flurry (With 1x2h it basically is always up, the uptime goes up a lot compared to dual wield)
1.3 heroism (You DO get heroism in Execute range right?)
15% gear haste (if you have less, use a 2h with haste on it for executes)

Final speed - 1.47 sec swings.

Pros of 1x2h:
- More stats (yes 1x2h has usually better stats then 2x1h)
- Comparable white damage (no misses with 1x2h)
- 2h Spec at work for executes
- Never miss/dodge or otherwise fail to swing, giving 100% certainty you can execute on gcd (- flurry dropping, when all you really lose is ~0.15 sec, which for most people will be actually less then lag induced loss in executes)

Im still not sold on the execute weapon switch btw, but if you do - use 1x2h.