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 following factors when choosing good bounties.
1. Rating- If the ICO has some rating. If this rating is good or high it is a indication that this is a good ICO.
This is not always the case but it helps. It is easy now to pay someone to give a high rating on your project.
2. Managers of the bounty- some managers has good reputation such as Amazix , Kripital etc.
Most probably this will help but not all the time but at least you have a chance with the project.
3. The team behind the team -IF the team is strong and capable with good track record it is a indication that the bounty and ICO will succeed.
These are the main points come into my mind.
This is the most important aspect if you want to really find out a good project. The team behind it plays a major role.