I think there are a lot of advantages to being fluent in more than one DAW. I'm
very happy that CbB has carried on the Sonar legacy, and I do feel that CbB is superior to Sonar Platinum due to the increased stability and subtle enhancements. However it's no secret that I've also used Studio One and Ableton Live since their respective 1.0 versions, and by being able to use each one for what it does best, I feel like there are truly no limits on my creativity. I've also noticed the music I create with each one is subtly different, even to the point of having a slightly different "sound."
I know that some people think it's hard to switch among DAWs, and that's true at the beginning of the learning curve. But once you become familiar with them, it's like riding a bicycle - you don't forget how to do it. And of course, the third-party plug-ins will work in all of them.
To me it's like guitars...I have electric, acoustic, and 12-string guitars. Each one has its own use and personality. They require different playing techniques, but that's not a deal-breaker.