Yeah, if you want to build synths/fx (or hardware interfacing) , Id generally go Axoloti (better patching interface that PD imo) , if you want PD/Supercollider - Bela... but for general purpose PI3, this is good.
possibly worth pointing out, many linux/rPI apps are ALSA, so wont work on Bela (without dev work) , and its also easy in Bela to start getting context switching (means you loose RT timing) - so Bela is not ideal if your using general purpose applications, and as @rick_monster said, a PI2/PI3 is quite a bit more powerful than BeagleBone Black.
personally, Im just happy to have choices...
btw.. Ive noticed the price of Organelles (in Europe at least) appears to have dropped a bit... quite tempted to grab one of those for playing on the sofa.
EDIT: a bit OT, but I hope if get a few more audio interfaces for rPI then the audio scene might take off a bit more, as it did on iOS... then perhaps Raspberry will feature a decent ADC/DAC in the rPI4.. just a thought.