Use whatever is easiest for you to get the job done You'll find yourself mixing Nurbs and Polys as you get more involved in Maya. Personally I prefer Nurbs, but I always need to use Polys here and there in my scenes. Just the nature of the beast
Darkon
Red bellows of flame have blackened my stones
Convulsing my frame and cracking my bones
Hell's dragons of steel who roar in their chains
Crawl into my caves to suck out my veins.....
-The Mountain P.F.M.