The boot time on the BB* is much faster when using eMMC instead of SD for boot. All of my BB*'s use eMMC for the OS. I use USB for storage only because it is easier to move the storage around when testing things, but if you need USB audio you can use the SD for storage.
I ran a BBB master the past 2 years due to the issue with the FMT-212R USB FM transmitter on the newer kernel on the Pi. I would prefer to run a more powerful Pi 3 for my master though and will be working towards that goal this year.
Unless you are planning for more than 36 P10 panels, I would not even be considering a BBB. The Pi3 seems to be better when using the Ron P matrix adapter board. I am even driving a P5 display using a Pi3 and the matrix board.
I agree, I would drive people towards the Pi solution as well. I'm also working on taking that a step further and using the commercial LED reciever boards by Linsn and ColorLight to drive the panels which will allow a higher refresh rate and more panel options.
Overall I'm weighing the pros and cons of using a RasPi as the FPP master vs. a BBB. I'm continuing to have multiple issues with power loss corrupting SD cards, so I thought a brief venture into the BBB was worth the investment. I have tried converting my SD cards to read only, as per the new script, and about 10 or so power losses in the card is corrupted. I have turned off all logging and it's still giving me corruption issues. Again, not all at once, but the failure rate is still there.
This sounds more like power issues or just bad SD cards. I believe we had people running the read-only script with systems that were powered off daily without issue and I know we had people that pulled the plug dozens of time when testing the read-only script.