SB X-Fi - which "mode" to use when calibrating ?

This is my first time using REW. I'll be using the original RS analog meter as my microphone, connecting it to my son's PC that has an internal Soundblaster X-Fi sound card. In my research on his sound card, I discovered it has three modes - Entertainment, Game, and Audio Creation. Does it matter which mode I use ? Would Audio Creation be the best ? It seems that it is geared for receiving audio input versus just outputing sound.

Thanks,
Bill