If you work alone from home as a freelancer and just deliver the rendered result, messiah is fantastic for animation (where LW sucks) and more and more also for rendering (consider the pro version for unlimited network rendering).
But as a freelancer who is working on location for other companies, you may not have too much luck finding studios who use messiah as a main tool.
Knowing Maya or XSI may be your best bets then.
I use all of them but Maya and I think it opens your mind to be fluid in multiple systems. Often you can transfer a technique from one tool to the other or - for instance - render hypervoxels with LW since XSI particle rendering sucks big time and combine it with other elements done in XSI or messiah.
PointOvenPro is a must in that case.
“Multitasking” is very important for freelancers IMO 
Cheers,