AT&T more expensive for me I just checked out AT&T's prices. Their plan would be $10 more a month and I'd have to limit data to 3GB, no texting and mobile-to-mobile would be charged.
I'm on an individual plan on Sprint, 450 minutes, unlimited mobile-to-mobile, unlimited text & data. With the $10 data fee, it's $79.99 monthly.
For a comparable AT&T plan it would be $69.99 + $20 for unlimited texting = $89.99. Only ATT mobile-to-mobile is free.
Verizon & T-Mobile don't have coverage where I live.