You mean on food, right? I wouldn't recommend wearing it as a fragrance!
Before I continue, DO expect this thread to be either locked or moved soon, 'cause we're about to step way beyond the realm of fragrances used for self-adornment!
Truffles overall are very deep, woodsy & earthy; super mushroomy -borderline 'gassy'.
Black truffles are more on the subtle, woodsy side of the spectrum compared to the more aggressive white truffles.
Black truffles, which are my favorite, stand out amazingly well in braised beef dishes.
I tend to like white truffles on very simplistic foods in order to showcase their complexity (plain pasta with butter or olive oil is the cliche); lighter meats with dairy-based sauces; they're really good with scallops.
The oils are a decent stand-in but no match to fresh.