Oh my god... you people are reading WAY too much into this. They just did it to show distinction between the teams. and btw, recoloring a model is really quite easy.
i said joy of the kill. the rush that you get when you see them get redbarred and then kneel to you is so incredible. thats what i love about pking, even though i lose money.
so i'm going for 99 defence myself, and i have found that combat is so much more entertaining than a skill like cooking. also, it seems to me that combat is more useful in the long run as well :P. but honestly, choose whatever you feel like.
I (in my limited capacity with only 77 mage) would say go for the enchanting. I have found it to be faster, and if you get the dragonstones as well, you could get even more exp. (i think)
I haven't been slaying much, but for me the points are a side effect. I'm not going for the helm, though that would be nice, so all I'm doing is slaying regularly at Duradel.