General question on Carbon fiber tonearms versus aluminum

Is it my imagination or is it real?  In a very general sense, do Carbon fiber tonearms sound a bit better than the aluminum tubes?   I am not sure but if I was a betting man, I would put money on the carbon fiber tubes.   Any comments here?

I'd especially like to hear from folks who have had both on their turntables or who have owned both just not at the same time.

Thanks!