[Bob Olhsson]

The best analogy I can think of is that using Pro Tools is like using a 2" 24 track recorder used to be. If you needed to move your project to a different studio in order to record or mix, you were in trouble with a 1" 16 track Tascam tape even though it often sounded just as good.

Digidesign was the first digital audio editing solution under $10,000 and became dominant simply by virtue of being first. Nothing enough better has come along to be worth learning for most professionals. A lot of us also use supplemental DAWs for MIDI or mastering.

If you aren't collaborating and moving projects around, there are many good choices.