All of the major 3D Apps have thier pro's and con's
I have been a Lightwaver for over ten years and over the years I have easily got back the money I spent in earnings and enjoyment.
If you're serious about 3D modelling and rendering then the best thing you can do is download trial versions, all of the major apps have trial versions, most of which are limit free.
Find out which has the UI that you feel most comfortable with and the toolset/workflow that best suits your style of work, when you find out which one you like, save your pennies. Don't just settle on a programme because it's cheap or free, you'll regret it and don't get a pirated copy, at best you'll have a semi functioning version without support and at worst....well you can figure the rest out.