Do we prefer Patreon, or the Sudo Humans system for recurring donations?
I would expect that Sudo Humans (powered by Stripe gateway?) might have less overhead costs?
Yes. We haven't set up sudo mesh / peoplesopen.net on sudo humans mostly because we've been thinking of it as a way to pay membership fees but we definitely could offer that as an option. Stripe is about 3% fees and Patreon is about 10%.