IMO: Sprint used to be beter than Verison. They used to have beter customer service and a beter network. This was before Nextell (i think) purchased Sprint. Now the network hasn't been touched in years, and about two months after the Nextell purchase I got these advertisment calls/offers from "Sprint Mexico" for about three weeks, two to three times a day (if they were trying to speak english the best they could for their greedy employer then I can't complain, but still it was bad). Verison in the meantime has put in some effort into improveing customer service and their network. I was first with Verison ages ago, then I was happily with Sprint until Nextell came in, and now I'm satisfied with Verison.
Edit: And I have had friends with AT&T who have switched to Verison or vise versa recently, the consencus is that Verison is beter in the network quality, coverage and customer service departments here where I live (which is probably all the ones that matter). Also in the past couple months plane old telephone services (POTS) to your house have been really hiked by AT&T. A few buddies of mine think it's a dirty plot by AT&T to make their overpriced cellular service competitive to their POTS. The conspiracy theory seems a bit much for me, but does make enough sence to not dismiss (like what did, in the past couple of months, change out here in POTS to make it cost as much as a basic cellular contract from AT&T?).