I would say the best hosting feature is cpanel, seeing as some hosts do not use cpanel.

The most unique I would say, is real support. I was talking to a support rep on RACKSPACE i believe they are called, one of those top ded sellers, and he seemd like a real live person, well he was, but he was talking to me like one, using slang, and talking about how he was tired because it was a friday night.

Most support reps are always perfect, and never have any fun with it, thats what I dont like.