I'm REALLY happy with Reaper (after using Vegas, Cubase, and Sonar).
Very solid, fast, un-bloated program that still has a ton of features.
Unless you need a notation view, it could be all you need.
Was of course only recently ported to mac, and may not be identical to the pc version.
I could not get into Logic (way back).
Sad to hear no Wavelab/SForge equivalent in the mac world. I long ago settled on
Wavelab out of those two. It is a mastering essential for me.