These three are not really all that comparable, except that they are all relatively sweet orientals. When the Directory comes back online I sugest reading the many reviews of each scent for some perspective on their different characters. In summary:
Ambre Sultan - thick, sweet, voluptuous amber of great depth, with extraordinary sillage and lasting power. Sharp herbal notes, dark spices and patchouli, give this amber an exotic, animalic edge. Far more complex than...
Ambre Extreme - anything but. A very plain, "safe," polite amber without the confrontational animal vibe that enlivens some other amber scents. A good amber scent for those who don't think they like amber.
Musc Ravageur - a spicey, musky, sweet oriental with plenty of cinnamon and vanilla. Not primarily an "amber" scent, though an amber accord is certainly present. A very warm, animal base. Not "unwashed," but distinctly lascivious. (A personal favorite of mine.
If it's the amber accord you're after, my two foremost recommendations would be Ambre Sultan and the somewhat smoother, softer Ambre Precieux from Maitre Parfumeur et Gantier.