I find racing simulators boring.. so take it with a grain of salt but I'll say GT had some good times with a friend with 4 trying to keep formula fords on the road :P

Banjo Kazooie or Mario 64

Mario with banjo a a close second.

Half-life or bioshock.

Half life because it was my first FPS and it was precursor at his time
Bioshock is mostly a non innovative FPS if you already played (see below)

Bioshock or SystemShock 2 ???

Bioshock (Havent played system shock )

FFVII or FFVI

FFVI, most definitely.


Tekken or Soul Calibur?

Soul Calibur ( because of Ivy's tits)  Tekken is better

Ninja Gaiden or Devil May Cry ?

Tekken.Because weapons don't turn me on and tekken5 is my favourite fighting game...

Ok here it is...

Prince of Persia(Sands of Time) or Asassin's Creed

edit:late :)

@ Onour11
double post
edit it :P

Nevermind.

Ninja Gaiden or Devil May Cry OR God of War  (GoW ftw!!)

 argh, that is not fair !!!!

Tough one. Going with God of War as a series, even though DMC3 is the best game out of all those game series, GoW produces consistently excellent games to take it.

Half Life 1 or Half Life 2?

EDIT: Excluding episodes and expansions (since CS was from HL1)