Being an exclusive is a selling point for me; and I like to support exclusive games. (and you don't have to call me a fanboy, I know I am one). Now, if I can only buy one game in the April - May timeframe, and I compare selling points for both LP2 and QT, and they are both multiplatform, LP2 ends up with more selling points for me.
This does not mean I will not buy QT, and I'm actually more excited now with the boxart, it just means I will need to consider it after I finish LP2 first.