I’ve used all three of those hosts as well as godaddy, and seen their services degrade as they got bigger. I find this to be true of other hosts as well. I’m using a relatively small host at the moment and get exactly the service in all respects, that I aim for– I figure I have a few more years with them until they get too big for their own britches. Deploying wordpress is a breeze no matter what the size of the company is, or how many times it gets used. That’s a useless metric these days.