I'll echo the others sentiment. Both are good organizations.
With that said, I sit on the board for Comptons and truly believe in the mission of our organization. The amount of time and money we put into getting youth involved alone is worth the effort. There will be no Traditional Archery if we can't get young folks interested.
I would say, join both for a year. See which is a better fit for what you believe an organization should be doing with your money. Can't go wrong with either.