Ah. Well, there's DP, and all the NI stuff, VSL, Redmatica, Ivory Grand, RMX, Melodyne, Altiverb, lots of other AU instrument and processing plug-ins... they all do well on Mac.
I use Nuendo and it's not UB ready yet. K2 is just recently UB ready. I still think the OSX/CPU (MacIntel) relationship is still a little green.
But I do use Redmatica Keymap on my Laptop... and it does Rock!!!
Nick you know me pretty well.... whatever works the best for the job at hand...
AK