If you are new to both programs, Biab is probably easier to use than Real Band. A Biab style controls what instruments are used so if you change styles and regenerate, you could hear all new instruments or maybe one or two depending on the style. In RB if you are using the first 8 tracks as Biab tracks, then it works the same way when you hit the generate button. BUT and this is where RB is so good, you can highlight a track outside of the first 8 like track 11 or 32 or whatever and select a style, then right click anywhere in the track and select either midi or a Real Track and then it will generate that one track only. The reason I like Real Band so much is I can either import a Biab song or create one from scratch using RB's chord grid (the same as Biab) and generate the song. That gives me a starting point. Then I start highlighting other tracks starting with 9 and generating new tracks using all different styles, some midi and some Real Tracks or drums. You have 40 additional tracks to play with. Just remember that by highlighting one track and using the right mouse click to select the instrument will generate that track only and leave the rest alone. Now you can have several different styles in the same song using both midi and RT's. That can be very cool.
Biab is easier to use because you put in the chords, select the style and that's it, done but with a lot fewer choices than Real Band.

Bob

Biab/RB latest build, Win 11 Pro, Ryzen 5 5600 G, 512 Gig SSD, 16 Gigs Ram, Steinberg UR22 MkII, Roland Sonic Cell, Kurzweil PC3, Hammond SK1, Korg PA3XPro, Garritan JABB, Hypercanvas, Sampletank 3, more.