ASIO versus WDM

Are there any advantages to ASIO drivers over WDM?
I have Delta Audiophile and I've been using the WDM, I've read on this forum that some of you achieve better latency with ASIO...
Are there any differences apart from latency? Would one type of driver be more stable / compatible with, say, VST plugins, than another?
sonar will default to WDM given the choice, but many VST seem to have been designed with ASIO in mind? Any thoughts?
Thanks in advance