Ok, let me the first to say...neither.
pop-ups just look old fashioned, and a bit generic. Plus, they are heavier and more complex than fixed, and don't look that good when in the up position. So that leaves fixed headlights, except that the NSX implementation is UGLY. They look tacked-on, as if Honda spent the least amount of effort to integrate them into the overall design that they could get away with. Other cars have much nicer fixed headlights. This is the least favourite part of my car, and I wish there was some aftermarket option that looked better.