All I can say is that it is extremely confusing right now. XSI is superior to the other packages regarding animation. But then, it’s more a 3D CG production solution platform. It is ‘deep’ and geared towards character animation, large scenes, complex renders. One might be more happy with Max and VRay. On the other hand, there are those cool plugins and the broad base of 3rd party apps for Maya. THEN… there is C4D which has grown by bounds and leaps during the past couple of years. It has a lot of cool plugins and addons and is the cheapest package when you wish to include hair and a cool particle system. So, you see, if you nail your requirements down, then you can match it against features in packages. Due to the fact that all of them are available as trial versions you can see how well you can work with each of them. Whatever you like to do, you can do it in Maya as well as in 3dMax, as well as in XSI, as well as in LightWave… The only difference is comfort regarding one or the other section (render, modeling, texturing, animation). Price wise, nothing beats the combo of XSI Foundation and ZBrush. Both together cover you verry well.
Good luck and don’t get to confused.
Lemo
PS:Throw in corporate politics into your selection process and you will never be able to make a decision regarding your tools.
PPS: Another alternative is to build your own 3d package with a separate modeler, renderer, texturing package… e.g. Modo 201 and Project Messiah… But there you go an adventurous way… At the end of the day you have to upgrade./maintain a BUNCH of apps…