Sorry it took me so long to answer this, but...
My suggestion is
GoW... I think it's now just officially taken over being my favorite Xbox 360 game, as of late. To be honest, if the storyline was a bit longer, I think it'd have the chance to be my all time favorite game.
I can't even explain how addictive this game is... and it looks so damn good when I play it on my HDTV... almost make me drool.
As for
R6V, I won't be playing that with the rest of ya'll until my birthday later this month... having a home mortgage to pay for makes it a bit tough to purchase
all of the games that I want to play at any given moment... I wanted to have
GoW at the time both games were released, so
R6V wound up being something that I figured on asking for as a birthday gift this year.
Needless to say, I instantly fell in love with
R6V from the moment I started playing the demo...
