What do you think is the best cell phone provider?

I am going to get a new cell phone with a new provider once my contract with Sprint ends in about a month. I am leaning toward Verizon but I'm not completely sure. A lot of my friends have Verizon but some of them have others and I heard that AT&T is a good company also. I don't want Sprint again because I had so many problems with Sprint that I don't think I would ever reconsider going back to them in the future.