I know I'm in the minority on this one as Eau Sauvage is overall a successful release for Dior and pretty popular, however... I could never warm up to the original EDT. There's something in it that is so past-tense old. Not saying it smells like an old man type cologne, just that to me it smells like it's an old, worn out formula, the citrus doesn't smell terribly natural to me, it's sort of dusty and a little scratchy. It's not BAD, I could wear it, but with so many other options out there - it just never was high on my to-buy list.
The Extreme is pretty much the original formula amped up a notch. Nothing exciting here.
Cuir Fraiche adds a slight leathery vibe to the citrus base, it's "better" to my nose, but, again, I've had this in my online shopping cart for 2+ years and have never managed to actually order it.
Then there's the Eau Sauvage Parfum, the latest release. I didn't care for it when it first came out, probably because I didn't care about the other three releases, however... I have tried it a few times while browsing other things in stores, and finally last week pulled the trigger and got a bottle of it. There's something new and fresh about it. Yes, it's nothing like the original Eau Sauvage, it's not a flanker in the way you'd expect. I think Dior was just trying to monopolize on the brand name recognition when they branded and bottled this juice. There is some slight DNA resemblance in the base, but, very minor at best. It's a whole different fragrance. There's something fresh, young, woody, citrusy, smokey, vetiver-y about it, with some wonderful myrrh that you normally don't see in designer level fragrances. I really like it, and I like that it lasts all day, unlike the original Eau Sauvage which lasts maybe couple hours (on my dry skin). Definitely the best of the four, and the only one I actually bought a bottle of. But, again, many people like the original - probably same people who like Habit Rouge, which I also find boring, dated, and artificial smelling. ;-)