Thank you all for the valuable feedback.

I mainly just use BIAB for Drums and Bass with occasional keys. I just want simple backings for my guitar. I use VST plugins (MODO Bass and SSD 5.5) in Reaper, so I'm not whether a full GM2 synth is needed... I've experimented with loading the VST's onto each track in BIAB but had a few crashes. I know I could just drag the MIDI into Reaper, but I like the spontaneity of using BIAB.