Which psp game should i buy for me to play during vacation?

I got two games that i'm interested in.

1.God of War: Chains of Olympus

2.Grand Theft Auto: Vice City Stories

I want the game that's the most fun and will still be fun even after you beat it.

GTA its longer and more to do

You say you wanna game even tho its fun when u have beaten the game? Go for GTA or Socom

You are going on vacation... enjoy the vacation first off.

Second, I would recommend Disgaea. Yeah its not on your list, but I love that game currently.

gta,it has more play time and the freedom degree.

Out of your two choices... I'd have to go with GTA because it has a higher replay value.