I use BIAB writing and putting the song together, RB to audition, generate and occasionally edit RT's. I use Reaper to mix and edit more there than I do in RB.

There are folks who use RB as a DAW quite well.

For me, Reaper's features are easier to use in my workflow and it works on my computer with fewer glitches. However, I do have to run it in admin so it's not a totally glitch free DAW either.

If you're used to Cubase and happy with it, you'll probably find yourself mostly using RB to generate RTs.