beaglebone black - Ramifications of Ubuntu vs Debian

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As of today, if I have it right, UBuntu is better supported by ROS than Debian. What are the ramifications of Ubuntu (which available but as far as I understand is not a supported Beagle Bone distribution) - will I lose packages that support features of the BeageBone Black? Will I just have to install said packages?
Or are they likely to not run right on Ubuntu? We are trying to get to a distributed (two beagle bone black) configuration of panel and bot, and get some PWM motors to run. Is the OS choice likely to make any difference? Thanks so much for fielding this noob quesiton.