I find that in general, my dabs vape. My BHO always vaporizes, if the nail is waaaay too hot the tail end of it might combust but I don't even taste the difference, I only know its burnt because I see it catch alight at the end.
However recently my friend gave me some bubbles hash he made (I live in a country with prohibition so we only get what we make) and that has a bit more plant matter and is somewhat more prone to combustion. However, with a bit of practice its very vapeable, I find, on the nail.
Which gets to the point, comparing my BHO to incredibly high grade buds I find the bud vapor tastier (the BHO has got plenty of flava, but some buds are just ridiculous). However, when I first dabbed the bubble hash I remember distinctly thinking, "This is quite possibly the tastiest hit I've ever had in my life". I really could not remember a tastier toke (maybe not coincidence).
Recently he gave me more, from his 25 micron bag, which he claims to be the best but it really doesn't taste as good.
So I think it depends on your product.