Turn fighting is definately faster, which counts in its favor. If it is 1v1, I'll give the guy a really aggressive merge to begind with, just to see what he does. If he doesn't react 'right', then I'll stick with the angles fight no matter what the planes are.
If he reacts 'right', either breaking hard into my attack or obviously using it to set up some sort of overshoot, I'll go up instead, to see what he does.
Keep in mind, thats only for a 1v1, 1vmany none of the same rules apply. You either go in fast, try to kill enough that the others run away, or you BnZ them to death.