Good god I love football, what a joy to watch. Thanks for the clip.
For me, it is without question Zidane. I won't say much about Ronaldinho, except that he's a truly great player who still has years ahead of him and will probably get a lot better.
But Zidane is just football beauty personified for me. It's virtually unexplainable, watching him at his peak would just leave me in awe because it was so intelligent and controlled. As others have said, he just made it look so easy, yet he was in perfect symphony with the ball 100% of the time and you would never see him over-elaborate, pure class.
Is, and always will be, a legend.