I was a long time att customer in the Ohio area, let me share my TMO, ATT, and Verizon experiences from the past 4 months...
When t-mobile ran their 2 for 2 promo this past November we moved 4 band 12 compatible phones from ATT to TMO. Over the 3 month time span, t-mobile was typically faster than ATT, but the consistency of coverage Was not on par. During my daily commute t-mobile cut out 1-2 times per trip, where ATT had been solid. During a weekend trip in NAshville we struggled to get service where friends had no issue. At that point we started doubting the TMO decision. We moved to Verizon the 2nd day the unlimited plans were released and have found 4 things. First, service is more consistent on Verizon than TMO or ATT. Second, battery life is 20-25% longer which is a pleasant surprise. Third, latency is better making service faster than the others. Fourth, coverage in constricted interiors is limited on TMO.
Your mileage may vary, but at the end of the day a phone without a clear consistent signal isn't worth crap. Your never know where you might find yourself at a given point in time. Ask yourself if a budget plan is worth it if you end up stranded at some point? After moving I continually doubted the choice for 3 months. The switch to Verizon confirmed that doubt. While I love T-mobiles approach and strategy, which is pushing the entire space, the clear winner for Ohio from a day to day usage perspective is Verizon. We All win thanks to the competition that exists with the Carriers, for me I have no regrets moving to Verizon!