SPDs are fine and dandy for the commuter / general workhorse, but for the nice bike - these days the titanium superbike - only proper road pedals will do. They just feel so much better. And I much prefer my Campagnolo Pro-Fits to my old Look Keos, look at them, they're
beautiful!
No experience of SPD-SLs though.
That being said, it's just my personal preference, you should use whatever works for you. I don't think anyone's really that snooty about pedals. If anyone is snooty about your gear, I would just turn around and ride in the opposite direction, they're not the sort of people I would care to ride with.
But I do love my Pro-Fits perhaps a bit more than I ought to
.