Answer:
Get a prepaid phone from Tracfone. I have a Tracfone and I even just bought my kids a Tracfone for back to school. Tracfone offers the lowest rates and great coverage. Also Tracfone has really cool phones to chose from. With a preapid plan you never have to worry about buying more minutes than you need.
I would 100% say GO PREPAID!!
ANSWER
It depends on your needs. If you need a high end phone, you should get a postpaid cell phone as you can get a nice phone like an Android phone free on the internet with a new plan.
If you just want a cheaper plan, you should get prepaid or pay as you go phone service. Again, it largely depends on your calling needs.