The top priority of the bounty program is that the project itself has a great potential so all the evaluation criteria available on ICO applies too. A project with innovative concept e.g. Hadron, or a fantastic team with amazing advisors e.g. Swapy are more likely to bring you higher rewards fro the bounty as the coin will be worth much more when listed. In addition, I'd also check out the bounty manager's track record too.