I would say go with what you know. No sense spending time on relearning if you can’t perceive the payoff later on down the road.
On that note, I had heard that a large number of the Combustion development team left Discreet. That team was scooped up to help build an app called Motion. That, along with the late development of version 4 for Mac, make me cautious about the future of this software. The payoff down the road may be that you want to be working in an app that will be supported in the years to come.