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/AllbebetBountyCommunityYou must not always sell at the first value. Sometimes if it is low it is good to buy more and increase what holdings you already have with the bounty as well. Then you will have a nice amount for if the price should ever go up. It is very disappointing when the price is so low but do not give up sometimes coins recover.