I race and train on clinchers. November RFSC58s and Stan's ZTR340s to be precise. Both wheelsets have Powertap rear hubs.
I mostly ride the carbon wheelset on the road with Veloflex Master 25s. I've had zero issues with them.
I've not ridden tubular but know a few guys who only race on them.
I only really bring out the Stan's wheels when I know the ride will have a bit of gravel since they have Gatorskins fitted. They get a lot of trainer/rollers duty.
I'll also use the Stan's for CX racing/training. I haven't decided if I want to run them tubeless or not.
I personally can't justify a 'race-only' wheelset and/or the hassle of gluing tubulars. At my level, I can't see that I would be able to notice any measurable difference between clincher and tubular in any situation.