Hoses for courses. I presume we are talking final polish or waxes.....
I have used mequires ultimate car polish on the GTR and the results were amazing. It didnt seem to work so well on solid colours but then it was specically reccommended for lighter mettalic/pearlescents . there are now special polishes for solid colours and even black cars which do wonders. Of course the paint has to be prepared first to get he best results but i will leave that part to the experts.