Im just starting out with ARM and BBB.. but about 30 minutes into angstrom, with the website being down, lack of support, lack of community, lack of documentation.... I switched.
I dont know which distro is the best for what you are doing but.. i think there are better options to angstrom. thats IMHO..
I have a few micro sd cards 8gigs or more and I have been flashing them to run headless distros of debian and ubuntu. at that level they are almost he same thing so. I like Debian because its what we used in school. I like ubuntu because of the support and documentation.
I also thought I read a thread on here about a month ago that had to do with BB switching from shipping bbb with Angstrom.. donno tho as Im still new.