Should I keep T-Mobile Prepaid or go with Straight Talk Pre-paid?

So I just purchased a factory unlocked Iphone 4s from Apple the other day. I was able to get the micro sim card, activation kit and $30.00 pre-paid plan offered on T-Mobile.com and set up the iphone with no problem. The only issue that I'm having is that the data speed while at work is so slow -- like 2G speed, that I can't stream Pandora or anything while at work. Went to the T-Mobile store and the rep there said that they are upgrading their towers and if I could be a little patient things should be better for service. In the meantime, I discovered that Straight Talk has a unlimited $45.00 plan, but I'm scared to cross over if it's going to be more of the same and I'm hearing that Straight Talk does not have MMS functionality for all iphone users. Should I keep T-Mobile Prepaid or cutoff and switch to Straight Talk Prepaid? I thought switching to an unlocked phone would save me some money since under contract with Sprint would cost $80.00/month compared to prepaid with an unlocked phone costing around 30-45.00/month, but I still want the data capablity as if I was under contract. Your advice is greatly appreciated.

While I'm a huge tmobile fan, straighttalk is probably your best choice.

To get 3g and good 4g speeds on tmobile, you need a tmobile phone NOT just an unlocked phone. So If you don't have a modern tower in your area, non tmobile phones on their network run on 2g/edge.

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