Maya is the major one used in film atm.
However, its out-of-the-box capabilities are extremely disappointing to say the least. Its main points of attraction are a large feature set, the MEL scripting language (which is the core of the whole thing, really. Means if its not in there, you can code it) and its fast openGL viewport performance. Oh..and the fact A|W just dropped its price like a $2 hoe.
Softimage is attractive because of....everything. Fast openGL performance, Mental ray, Realtime shader support. Soft field two products - XSI which is the new one, and 3D which is almost 15 years old now. Soft|3D is damn scary - dont try to use it because it will put you off 3D for ever.
Anywya...its too late to write a proper review but stick around a few graphics boards and you'll get the general idea. XSI is technically superior but market-wise has

of catching up to do, still.