IMO BEST WITH A DEDICATED DAW.
RB
is a dedicated DAW. The big difference between RB and a standard DAW is it will work directly with Biab files.
BUT, RB IS NOT SIMPLY ANOTHER VERSION OF BAND IN A BOX.
That phrase needs a second read.
If you treat RB as the DAW it is then when you open a Biab file all you really want is the chord grid. The first thing you do is check the box that says "Treat all Biab tracks as standard tracks". That means they will not automatically regenerate. You may or may not want to keep them but for now assume you want to keep them as is.
Now you have all the normal DAW functions PLUS the ability to add more Biab tracks but under your full control, one track at a time. You may not really like one of the Biab tracks you imported. Fine, generate another version using a different style if you want. Then generate another version using another style. And another, and another. You have 48 tracks to mess with, see what I'm talking about now? You can do that with every instrument from the original Biab file. You may wind up with a song that has ZERO tracks from the original Biab file. All you really needed the Biab file for was the chord grid. Opening a Biab file saves you from having to reenter the chords.
Now, this is the tip of the iceberg. Keep reading the RB forum and watch the RB vids. There's a whole lot more you can do with it like adding a midi file for example. Combining Biab tracks with parts of a good well made midi can do wonders for a song assuming you have a high quality synth. No, the Coyote Wavetable or the Forte Dxi are not high quality synths. I use Sampletank 3 others use Kontakt, Garritan or other softsynths. Those cost real money but the sound quality definitely compares with the Real Tracks so they blend in very well.
People have said that RB's midi editing capabilities are not that good. I don't know because it's all I've ever used and I think it's pretty good but like anything else you have to jump into the help files and mess with it yourself. I can do quite a lot with midi in RB. I've read that Cubase is great with midi and that could very well be but Cubase costs $700 while RB is free. Free works for me.
Bob