As full time or part-time bounty hunters identifying best bounties are very important since there is a tendency of increasing scam ICO''s now. Here I am giving some attention to the following factors when choosing good bounties.
1. Rating- If the ICO has some rating. If this rating is good or high it is an indication that this is a good ICO.
2. Managers of the bounty- some managers have a good reputation such as Amazix ,  Kripital etc.
3. The team behind the project -IF the team is strong and capable with good track record it is an indication that the bounty and ICO will succeed.
These are the main points come into my mind. Please include all your valuable suggestions here!!