These are my personal guidelines to myself on choosing a bounty to participate
1. Bounty budget, Not to big and not to small because big rewards also has a big chance for scams
2. Project, check if the project have an impact for the crypto community
3. Team, if the team has a good reputation
4. Manager, check also if the manager is reputable because reputable bounty managers dont choose scam ICOs.
yes that's the perfect answer,
the prize manager is the most important and also read the developer's white paper, before going any further, stay away if the project is deserted and unpopular with many people.