In case you choose charity - I've been fundraising on Steemit since 2 months and we have recently created the @steemitcharity account that will consolidate the charity posts from different users... And all the money we get will be 100% donated! (no retention fees and other BS:)
Anyways good luck with what you do!
what about SP?
@liondani to your question - SP will accumulate and used to bring us and charity poss more visibility on Steemit