Sprint or att? please help me?

I hardly talk on the phone so 450 minutes is enough for me, I text all day everyday, so unlimited texting is important to me. I'm on the internet on my phone 24/7 on fb, twitter etc. I know sprint has an everything data plan, but it isn't the unlimited plan...yet I don't know what that means, what company is better for my needs? Please.help I don't want to pay a fortune
 
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