ASIO vs WDM: What's the Latest Opinion?

Greetings:

Until the other day, I've always used WDM drivers with my Delta 1010. For whatever reason, after installing Sonar 6 I decided to try the ASIO drivers, but haven't noticed a major change.

So, is there a primer somewhere about the advantages and disadvantages of ASIO vs. WDM. One advantage for the latter, I noticed, is that the drivers apparently can be independently named, while ASIO drivers are automatically stereo pairs.

Thanks,