COSMIC FRIKKIN' POWER!
I was a hardcore D&D player, but recently I played my first White Wolf games. I started out playing a short Mage: The Ascension game and then moved into an Exalted game.
Something about the White Wolf system encourages good role-playing for me. The books are far less focused on rules, and are more focused on story, character, and ideas. The system, I feel, can be quite transparent. D&D on the other hand, focuses very heavily on rules, possibly trying to represent role-playing mechanically.
Exalted, being a White Wolf system, has the great role-playing potential of having a relatively transparent system. Add to that the fact that the setting is fantastic, the feel and flavor are wonderful, and the PCs can feel like uber-powerful gods... that is until they realize that they're not. Exalted does an amazing job of making the PCs feel incredibly powerful, and incredibly weak and vulnerable at the same time.
One last thing that I love about Exalted. So many of the skills and magical charms are non-combat related. Combat is important, but non-combat abilities are just as - if not more - important than normal combat skills.
Some examples of Solar Exalted power:
My character used his Majestic Radiant Presence and commanded some mortal enemies to release his friend and submit their lives to him. My display put the fear of the Unconquered Sun into them and they wept and pleaded for death.
A friend of mine used his Craftsman Needs No Tools to keep an army supplied for a week. They'd bring in their damaged weapons, and he would simply stroke the weapon and speak to it, mending it and making it better than when it was first crafted.
This same friend spent an enormous amount of energy to fry a demon who was standing on a plate designed to ward off evil. The amount of energy was so great, that the sun rose in the middle of the night and blasted a ray of energy that fried the demon. The expenditure of energy was so great that the sand path around the character's tower turned to glass, and the pillar of light that shot up into the sky could be seen thousands of miles away (a flat earth, you know).