hey guys ! i wanna get the mbp.. but im torn between this two

1. mbp 13 2.66GHz (high spec of 13" )

OR

2. mbp 15 2.4GHz (lowest spec of 15 ")

my budget just between this two only..i cant afford to go upper more due to limitation of budget. Btw, how bout the software and stuff ? does this software such as final cut already installed or have to get it separate?

What do you guys reckon?Which one i should get ?any extra stuff that i should get aswell ?

thanks !