I first saw the anime and then read (big part of) the manga. And well...I still think the anime is better :wavey: becouse of the music. The first OP was just...Awesome with a capital and most of the backgroundmusic (with the saxophone) was cool as well.
Remember the moment Onizuka drives onto the schoolgrounds with his newly won car (money for the school trip or somethin like that)? In school everyone is standing in front of the windows and they have a look on their face that reads "WTF?" The Man get's out of the car and INTRODUCES HIMSELF AGAIN

then he goes like "nice to meet you" (je roskuh or something like that in jap) and there is a complete silence. Then some kid goes all "YATTAA!!!" and music kicks in... Man that was such a great moment...I nearly peed my pants in joy.