BlackJack 2 or Sidekick 2008?

I'm 14 and i currently have blackjack2 for prepaid. Which causes me to pay a dollar a day and an additional $20 every month for my messaging package. I love the sidekick 2008. and the prepaid plan looks awesome for me. (only a dollar a day for unlimited txt/email/internet) But the problem is that i'm not sure if I should change my phones. Help!