It's only a couple of dollars different for TV, I am looking at a bundle package of TV, voice and Data. For Voice, Comcast is cheaper, for data, Verizon wins (with almost double the speed to boot) and they are very close for TV with a slight edge to Fios, there may be a couple of channels that one has that the other does not and vice versa. I also only want cablecards, so DVR and/or STB fees may differ one way or the other, so depending on what you need for Hardware, 1 provider or the other may come out cheaper. Also, I know Comcast has different rates for every individual town, I'd assume Verizon has different rates based on town as well.
For me, planning on getting my First HDTV primarily to see NESN and FSNE in HD, so until FIOS can get those up and running my choice is made for me. Like I've heard before on these boards, Let the Price Wars begin! The Gravy train for Comcast is coming to a grinding halt. Unfortunately, it will take a while for Verizon to lay down enough infrastructure to really take away from Comcasts bottom line and start the cycles of stealing each others customers with attractive sign up offers. It's been what, 25 years in the making and now, finally, the cable company monoply is dead.