This isn't intended to hype them or something, neither am I paid to do this, but I think BountyHive is one of the best bounty platforms around. I say this because they usually have specific number of participants that are admitted to different bounties (Signature, Social media, contents creation, and Translation). Once the required number of participants gets filled, it's closed for admission. This ensures that the bounty hunters get maximum number of stakes and tokens from the bounty.
I recently participated in one of their signature bounties, and got a handsome amount of tokens at the end of the campaign.
That's right, a great platform, good community, responsive support, good rewards, only profit from it almost no. This affects the choice of projects, and the situation on the market.