Blackberry 8800 OR iphone?

omg im so undecided on wich phone i want and im only (14) years old and i want to know which phone would be better for a 14 year old and being that this is going to be my first phone ever i want to pick the right one and i dont want to have any regrets after wards HUH please HLP ME im going to be getting it for christmas and thats only 4 days away