What should you be aware before making a choice?
closed as not a real question by Noctrine♦ Feb 13 '12 at 1:22
It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, see the FAQ.
That is a vague question. But still.
Choosing 3d modeling software is personal thing. There are number of softwares available and many of them have big number of features. So you should try demo of every one of them, try to model something more then simple, and whichever "clicks" is the one for you. Except for the price feature.
You have popular max and maya but are pretty expensive. you have as good houdini (with good free version, 'apprentice') and XSI (which is as good and cost less then max and maya and from personal experience has best workflow of all)
and there is free blender for which also has all the "big" features, and is free. But it's UI IMHO is unintuitive. But it's free.