Comcast is horrid. I had them in Jersey City. I lost internet service for several days. They couldn't decide whether they needed to be inside or outside to fix the problem, and then refused to credit my account for no service and tried to say it was an "inside" problem after I had a guy outside my building repairing wires. My rates also about tripled over a three year period.
I think I had to call Fios support once- they wouldn't take my credit card at first, when I moved a couple of blocks within JC.
I would not leave Fios unless I was forced.
I've moved around alot and have had almost every cable provider in the area (TW, Cablevision, Comcast, Verizon). Comcast was by far the worst. Cablevision and TW also stunk. I told my wife when we were house hunting that no FIOS service would be a dealbreaker. Best service out there.