I'm quite fond of most of the scores used for DBZ over the years. Even the recycled Mega Man music for the Ocean dub post Frieza
Shunsuke Kikuchi's score for the original version is great, gives DBZ that 80s martial arts film feel. Only flaw is that it got a bit repetitive by the time it hit Cell/Buu, but it still suits DBZ well. Also Spirit vs Spirit with Hironobu Kageyama kicks ass. Nuff said. However, I don't think Kikuchi's score fits Kai at all. The faster editing of Kai clashes
horribly with Z's music, and the track placement feels sloppy and ill-fitting. I realise this was due to the need to hurry with a replacement score thanks to the Yamamoto plagiarism debacle, but it is most unfortunate.
Shuki Levi's stuff for Saban Ball Z is the most nostalgic to me as it's DBZ as I remember it from Toonami. Rock the Dragon all the way. I actually really dig the synthy style of Bruce Faulconer's score too. He came up with some great themes, like his SSJ3 transformation theme, the Gohan Angers themes and especially Spirit Bomb. My only two problems were that he didn't really use silence enough, and he TOTALLY botched Gohan's SSJ2 transformation scene.