guitartrek
Rain - I checked out Logic 9 and was surprised how much it looks like X1 and X2 with the Arranger, Inspector, the list, the editor windows - same window management as the Sonar skylight interface. Did Sonar get that look and feel from Logic? Or did Logic get theirs from Sonar?
Logic, back in 2007 IIRC. Screen sets were also something that was first implement in Logic, way back in the early days. :)
To the OP - you can't go wrong w/ Logic and Mainstage. Most of the guys I know who have laptops as part of their live rig (usually, keyboard players) are using MainStage.
I've used Logic on a MacBook Pro for over two years now, 5 or 6 days a week, usually 8 hours or more a day. Bought the MacBook, installed Logic and I was done. No optimization, no tweaks, no need to mess w/ the task manager and to kill processes running in the background or to worry about stuff loading at startup....
The only times in two years where I actually had to think about technical/computer related-stuff is when running POD Farm, which is by all account one buggy piece of software on the Mac side, and when I first upgraded Kontakt to version 5. That one didn't play along well and it took a bit of tweaking.