An LE system is no more stable than any other program. The TDM systems are stable because they don't rely on the hardware inside your computer. They're also the price of a very nice SUV.
On the Mac side, PT has the least amount of plug-in options (as far as platforms), minimal midi support, and a track limitation.
So as I said before, find the one that works with you. Do you do a lot of midi stuff? Are there particular VI that you want to run? How many tracks do you want to be able to playback? I mean this is all stuff that you can find just by going to the manufactuers website. There is no sonic difference, it's just finding the program that fits you and the way you work.
I personally loathe cubase! I would use some TDM hardware if someone through it in my lap, but even then I would use DP as a frontend, because it's the program that gives me all the features I need in a format that I don't notice while I'm working.
Only you will be able to tell if some software is better than the other, it's like asking which is better, a mesa or a vht, fender or gibson, ibanez or jackson, ect.