This is always a funny question to me.
IMO, the choice is really yours and seems pretty straightforward.
If SONAR X2 is your DAW of choice then find the mobile rig that will run it to meet your needs. They are out there,
If MacBook is your platform/computer of choice then get a DAW that is made for it and meets your needs. They are out there.
Ever since X1 (IIRC) bootcamp is no longer a viable option to run SONAR on a Mac.
HTH.