The thing about Realband is that it supports BiaB features way beyond any other DAW.
Regeneration alone makes it worth learning.
No other DAW does that.

So if you are paying for BiaB features, you may as well learn a DAW that uses BiaB features, because you move on to a DAW to improve your final project, but sometimes you may want that DAW to be able to regenerate sections. That happens a LOT here.

In all other DAWs, if you decide to re-arrange the song, or add a verse, you have to go back to BiaB and regenerate everything, then import it into the DAW.

With RB you can continue to generate (even small sections) right on through the DAW stage.
Other DAWs DO have certain features and aspects that may make you eventually need to use them, but until then I agree with the above posts; learn RB as a DAW. Most of what you learn will 'translate' to other DAWs, so there is little time wasted on learning it.

You'll also learn what it can do that the others can't, and thus know when to switch to which DAW. Saves time in the long run.

Make your sound your own!
.. I do not work here, but the benefits are still awesome