Funny this thread popped up again, as I just re-tested Amber at the mall today. It's much soapier than I recall from the last time I smelled it months ago, when I found it a sweet, powdery, musky thing in the vein of Le Mâle. (My nose must have been off that day, or maybe I confused Amber with Infusion d'Homme? Gah, how I loathe Prada's naming conventions.)
I dig the slightly rooty (iris?) drydown countering the sweet soapiness of Amber's heart, and it's clearly well-made, with excellent tenacity. But overall, I prefer the Mugler. "Soapy" is simply not my favored category of scent, and the Prada doesn't have much more going on besides that: soap. The Mugler livens things up with that zingy vetiver, smooth, almost milky musk (I swear there's a dash of ambergris somewhere in the mix), and synthetic steam-clean haze that somehow makes my mouth water. I'm bored by the Prada, but fascinated and delighted by the Mugler. Sadly, I haven't smelled the Gendarme so I can't make a comparison, but Mugler gets my vote (and dollar).