I should mention, unless you're unhappy with Carrara or are taking on a job that requires you to learn a specific 3D application, there's no real need to venture away from the program  you're using. Carrara, while not standard in its interface/approach when last I looked, was still a competent modeling, rendering and animation software. While its workflow and interface were not to my liking, there are hundreds of folks who love it. 

There's no way for me to know how long you've spent with the program but if you haven't given it a try but you own it, before looking elsewhere, you'd be best off trying to learn to work within it. 

For everyone else looking at 3D apps...one of the worst reasons to buy a program is art you've seen other people do with it. Honestly. Just because John Smith can wrangle a polygon in Modo doesn't mean you can, the same goes for any of the other software out there. Try before you buy and do not judge a book by how pretty the pages are...read it.