Uhm, well I use Verizon Fios and I think they are awesome because we get 25mbps download and 5mbps upload as well as a monthly limit of 500GB+ of download/upload which is like, unlimited for our use. Oh and uh, in the united states, verizon and at&t are the two big game players.
It's only Verizon or AT&T, right now I use AT&T and I'm quite satisfied with its service. Some people don't, so it really depends on your experience with it.