The best bounty is hard to assess as you know if it was good or “best” only after the coin hits the exchanges and you see what value the market gives it.
But I took part in Allbebet bounty - this was the first time I do it, only because I firmly believe in the success of the project.  Allbebet ICO Bounty Program has best rewards. I would really like to recommend that you should participate in their bounty campaign (Here is the link: https://bitcointalk.org/index.php?topic=5178366.  ) to get highest rewards for any campaign.

 You can join their community to get all the information: https://t.me/AllbebetBountyCommunity