Straight Talk VS Boost Mobile

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I had my cellphone from Tmobile and everything was fine and then 2 months ago i got a bill for $250.00. I called Tmobile to see why the bill was so high and they simply said "we do not know". Now i am in search of a new carrier and i have chosen to go to a prepaid wireless company once again. I've had Straight talk in the past and they were great but i have never had Boost. Could anyone tell me which one is best and which is better coverage for someone who lives out in the country:)