defensive ratings of the players on the teams
if you win with 30 points your ratings are better ;) If your defense wasn't dominating, then your offense was so dominating to make even less fouls on this theory to fix the thing. And if you think you just won, because of the Rebounding difference, you could look at the fouls per possesion.
I don't like the team rating that much, because they don't tell a lot anyway.
experience level (you could get average age, although a fairly inaccruate representation of experience stat)
If you like to count the average age i wish you a lot of fun, you need to consider all the player playing and there minutes to get a number you can not really trust.
Experience could be a factor for it, and would favour mostly the stronger teams, because top teams in the BBB are nearly impossible to build with young players.
You might need a large sample to rule out the impact effort and game shape probably play.
effort is a not a term in the bbb, and gameshape currentspondent to the abilities so it would affect it like additional skills and if that made up the difference betwen the team i wouldn't look on that game because it get close.
I had an sample over 30-50 games, where effort wasn't also nearly a non factor.(yeah i know old engine^^)