Sonar for prime DAW, I think I know it the best.
ProTools 10/11 only because of 11 rack hardware.
Live 9 suite because of max apps and looping stuff
Cubase 7.5 for midi and hardware midi devices.
Reason 7 for some of the reason rack extensions and some Rex library stuff I have, works best in Reason native.
FL Studio 12 for piano roll easy midi /loop stuff and painting notes really easy. I use FL Studio more than Live now.
so to answer your question, no it's kind of a pain in the ass going back and forth between DAWs.
but it all depends on what I am trying to achieve. Each DAW has it's different work flow and does some things really the best. not 1 DAW I have has all the workflow or functions I love and need the most. I have to use multiple DAWs to get what I want done some times.
generally I just export stems or WAVs and import into Sonar and then mix play in sonar. if it's just straight audio like vocal or guitar then I generally just stick to Sonar. All depends on what I need to do.