never tried lofting birail or NURBS. Polys are easy to use for almost anything and you can model in low poly then smooth it. I like sub-d because you can work with it like polys and you get the smoothness of NURBS... the only catch is that it's more demanding on your resources.
Take a glance at my <a href="https://forums.simplymaya.com/showthread.php?s=&threadid=9428"><b>Porsche 959</b></a> WIP