i had verizon for almost 5 years. their customer service is the best. i have sprint now mainly because i work for them and it is free. they have the best phone with the best features and definatley the best plans. they also have the EVDO(that verizon has also) that it is faster than any wireless card out there.
sprint service has been expanding more and more. i get service pretty much anywhere i go. plus there are no roaming fees anymore!

my 2 cents