Steve:
I try not to have one preferred anything in golf course design. Different choices will be better for different places.
I am the world's biggest proponent of fescue greens. If you have fescue fairways and not fescue greens, it is only a matter of time before the bentgrass creeps out into the surrounds, and you lose the tight surface that's so good for putting from 20-30 yards off the green. But, I wouldn't put in fescue greens unless the soils were suitable for the greens and the fairways.
If the situation calls for bentgrass, I generally prefer to choose a blend instead of a single cultivar, because I remember the problem of C-15 decline in the midwest twenty years ago. We used the "Dominant" blend on courses in Virginia and Arizona a few years ago, both in tough climates [one hot and humid, the other hot and dry], and neither of which had a big maintenance budget, and both superintendents swore by it.
I've used A-4 three or four times now and I don't have a bad thing to say about the grass itself ... well, actually one thing, it doesn't recover from ball marks very well at all, but it's a great putting surface. However, I don't like to use it because I know the superintendent is going to push the greens to 13 on the Stimpmeter, and I would prefer that was impossible. But I would probably use A-4 if I the super reported directly to me.
By the same token, I'd use one of the new Bermudas if I was in Georgia or Florida. People are always trying to push bentgrass further south, but after 2-3 years they get into a cycle of overwatering and even if the greens putt well, they're mushy for approach shots. I played on Mini Verde greens for the first time at Indian Creek in Florida three weeks ago, and the greens were almost too fast, so I can't imagine anyone used to bentgrass complaining about it.
And I haven't putted on our new paspalum greens in Mexico yet, so I have no opinion of that grass until I do.