Choose according to your skill set and the potential profit that you might get. Actually i don't quite understand what you refer to but if you mean what type of bounty you could join i suggest that you try everything. you could start with a signature bounty campaign. Now, filtering the bounties that we have in the market, you could start by choosing the managers that have good credibility. better yet if you coculd try to explore more and go to those bounties that offer a specific amount of stake per post.