for those whom have the ps3 and the 360

ok do you guys have trouble choosing the game you want for the sytem as in if the game comes out for both sytems how do you choose wich one you will get it for? Here is an example..... the 360 was my main sytem untill now and im getting the ps3 yet my friend is getting the ps3 also and im gonna wanna play those games with him yet im i saw that R6V 2 is being released for both and i have it for the 360 and i was in clans and wut not....so i wanna keap playin it on the 360 except he only has the ps3.for those whom have the ps3 and the 360
i always choose by what console plays it better. and i figure that out by reading the review.