Which phone should I get?

Okay, I've decided that I might change to Verizon if my parents switch. So I have some opinions on the phones. For Verizon I might get the Verizon Wireless Blitz or a BlackBerry. If I go with AT&T I have a choice between the Samsung Propel or the iPhone. These are probably the only 2 companies my parents will choose so please help me pick a phone of your choice or from the ones listed.