I wear jammers. Briefs carry too much negative stigma for me to want to wear them. For about a month, a lane mate and I wore board shorts for drag, but the experience did not convince me that drag suits are all that beneficial. The principal effect of a drag suit seems to me to be that it slows you down (forcing you to work harder to keep up your non-drag suited pace). If I was so fast that I thought the intervals we swim at were too slow, then I could see the point of wearing a drag suit (we have a guy like that). That's not my problem, though. The intervals are perfectly hard enough as is.
Drag suit -- Nike preferred, Dolphin next, Kiefer after that. I wear them primarily because they're cheap and last forever. Forever. I've had 3 or 4 poly drag suits rotating over the last 2+ years and none of them are showing signs of wear & tear.
I know this is a stereotype, but if I see someone new show up to practice wearing jammers my assumption is that they won't be a very fast swimmer.
I agree. But, I've been proven wrong a lot lately as well.
Nylon brief with poly Dolfin drag suit over it. This was also my non-taper meet racing apparel until the nonsense of banning multiple suits came into effect.