I have seen a lot threads here about how to choose good bounties. It shows the challenges many of us here are going through in choosing a good bounty. If you really want to maximize your chances of participating in bounties of successful ICOs, i will recommend Bountyhive for you. The success rate of their bounties is very high. Their social media campaign is less stressful because of the absence of weekly reports. They have a limit as to the number of participants in each campaign thereby enabling you to earn a higher income. Although there are certain drawbacks in their processes such as your inability to see your weekly earnings on their spreadsheet, in general their services are really good and i will recommend for everyone
There are many bounty site now that appeared in the forum, maybe because to avoid scam ico, just like bountyguru according to my experienced on this site most of the ico project which I had joined was paid me on time, then bounties here on bitcointalk is also good but need to seek it very well before joining in.