This is a tough choice for me because the two choices don't offer much nuance.
In the way that I use BiaB I either don't notice the bugs/clunkiness/dated feel or if I do notice I can live with it since I get out of BiaB and into my DAW as soon as possible.
But on the other hand if the programmers could incorporate truly new and useful features then I think I'd be happy for years. [To be sure, I'm happy now.] I really don't need the "business as usual" with more pre-defined styles added onto the zillion styles we already have, many of which seem to be duplicates.
Two noteworthy new features for me would be:
a. an AI capability that can accept an audio file as input and create a BiaB "style" based on that audio file
https://www.pgmusic.com/forums/ubbthreads.php?ubb=showflat&Main=101811&Number=770140b. the capability to craft or find a drum/percussion pattern similar to the EZDrummer capability
https://www.pgmusic.com/forums/ubbthreads.php?ubb=showflat&Main=104862&Number=801236Forced to choose, my answer is 1 (but I don't need 50 new features or 212 more RealTracks)