Correct me if I am wrong, I think you are actually speaking of the Libertarian Party. At least to my knowledge that is the party in the US that fits your description, and I will use that term in this post. There is tension between freedom and equality. The Libertarian party puts it a little differently. They have one scale for where a person stands on personal freedom, and one scale for where a person stands on economic freedom.
Libertarians prefer freedom in both cases.
The point I wish to make is this. Then again, the majority of people who find the Sudbury model appealing don't care a whit about political philosophy, but care a whole lot about their children's happiness and well-being.