Yeah, I like rigging in Poser alot... but it's the only application I've ever rigged in so not much to compare it to. The tutorials I've watched on rigging in Carrara seem pretty straight forward so intimidation isn't a factor. Would kinda suck if you couldn't save your weight maps though, I'll have to look into that. 

I have a ton of Poser content, some of which I've used in Carrara. I like Carrara's implementation of traditional 3d manipulators way more than the posing tools in Poser. Mostly nowadays I use Poser as a finishing environment for self made content, though. Modeling is my real interest in 3d, rather than the final render of appropriated pre-made content.

I am a little worried that esoteric information about the inner workings of Carrara might be more difficult to find than with Poser. Editing native Carrara files for example.