I do not use RB at all. I did look into the program when it was first released, but I didn't like the feel and the workflow. So I can not give any form of comment on the latest versions of RB. I did buy and use Powertracks Pro Audio 12 for a while. I liked it and that DAW worked for me, but then I tried a version of Cubase. That DAW fit me like a glove. The workflow, the great VST's and VSTi's that come with it and the support for third party VST's are great.
So Cubase (6.5 at the moment. I do have 7 (grace period), but I have to upgrade my XP to Win 7 or 8 first) is the heart of my studio. I use BiaB to compose music and create certain tracks. These are all imported dry (with no effects and no panning) into Cubase where I add other tracks, apply effects, edit tracks etc. I also do quit a few live recordings of bands and choirs with a Roland R1000 recorder. All these tracks are loaded into Cubase so I can mix them.
I think there are a lot of great DAWs on the market these days. Ranging in price from free to quit a lot of money. Yes, there are differences in these DAWs, but in the end all boils down to the skills of the man/woman behind the wheel. If you bought BiaB, you got RB thrown in for free. If RB works for you, that is great: no need to look for a different DAW. Should you run into limitations or develop the need for something else, that will be the time to look around for another DAW.
Just like I have worked with Windows XP on my DAW-computer and never felt the need to upgrade the OS. Untill now, since Cubase 7 will not install on XP. That's when you run into limitations and are forced to look for something new.