I personally like TrueSpace. It will do NURB Objects like Rhino .. as well as a few other things. So .. as you see.. it's really a matter of how you work that makes the app the "best". Most of these have Demos you can get.. so my only advice is to visit a few websites.. see which ones are within your budget.. gab the demo.. see if you like how it drives.. and take the plunge :)

The doctor says I have way too much blood in my caffeine system.