We have never used Comcast so I don't have any opinion there.
We have been using Verizon for over 2 years and are extremely pleased with the service, the technicians who have had to come out numerous times to try to figure out the old wiring in our house to get the service to work correctly, and the awesomely quick response time of them when our modem went bad and we needed a new one. They shipped us a new one on Friday and it came just last night and now works perfectly.
We are very pleased with Verizon!
Their prices aren't bad, either. I can't remember offhand what we pay (all our Verizon services are bundled into one bill), but I know it is lower than what we paid when we lived in another town and received cable internet through Cox.
at 4:35 PM on Apr. 14, 2009