POLL: Which Driver Mode do you use? WDM/KS or ASIO?

I'm just wondering which Driver Mode most Sonar users are using, WDM/KS or ASIO? And also why are you using that particular one?
 
This setting is the one in Options/Audio/Advanced tab under Playback and Recording.
 
According to the Sonar documentation, if you have WDM, you should try that first.
 
For the record, I'm using Windows 7 Ultimate, Sonar 8.5 64bit with an i7 processor, and a Delta 1010 soundcard.
 
Thanks,
 
Brent