I've asked that before but didn't really get a response, hopefully someone sees this who has played with both.

At another forum I was told that s/p doesn't sound quite as good, but personally I think going with s/p and avoiding the hum can sometimes be enough of a benefit to make up for the subtle difference in sound.

I wish I could play around with a guitar with s/p as well as my current guitar (it coil splits) so I could be more helpful here.