There is one of the most complicated questions in the bounty activity. Try to find a few good managers and participate in their campaign. Also, find a few members of this forum with high rank and just track their companies they participating. A small lifehack from myself 
in fact, it is necessary to take into account a lot of factors that influence the real results of the Bounty of the company. Of course, managers and Technical information about the company ico very much help in determining the quality Bounty company, but I still pay attention to the activity of the collected funds from investors.