I'm trying to decide between the two of them as my go-to as well. Sprint offers more overall rural coverage in my area (southern Wisconsin) and is cheaper. However their voice quality to me just doesn't sound as good, and I can pick up on Sprints media re-compression often enough that it bugs me. Although T-Mobile has enough EDGE/dead spots to be annoying at times (building penetration), I tend to be happier with their service quality.
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