cat jl3 signatures vs. atmashere ma2III's

Has anyone had the cahnce to hear these amps side by side? I was wondering what the sonic differences would be between them. I have heard the cat jL2 signature but have not heard the monoblocks. Do you think the atmasphere would give me the bass slam of the cats. I know both have great midrange and I know that the cat will be a little more "maintenance" but which one do you folks prefer and why? Any input would be much appreciated.