It all depends on what you are doing, how you want it to look, how you are lighting it and all that jazz.

Yes, a larger aperture lens will allow you to do a lot more selective focus.

Each lens has its strength and really it is what your vision is. Is it the big headed dog look? Which is artsy and almost silly? Go with a super wide angle. Is it true realistic portraits, like you would want to see in canvas? Go with a longer lens and smaller aperture.

I have everything from 11mm-200mm, Some F2 lenses, and I use them all for different reasons.

Not a definitive answer, but, then it is not a definitive thing