Choosing a bounty is my own way of analyzing and searching for a good project.
I consider a lot of factors like
The team
The amount allocated for the bounty pool.
The idea of the project
Etc

Choosing a bounty requires bit skills and analysis on the project like going through the white paper, road map, team behind and the advisers for the project. Apart from this we need to check the project reputation before coming in to crypto market, if the project has good reputation and has potential in the market then we can go ahead and choose it.

I am just a Member on rank in this forum and you are ahead rank than me. I assume that you have more knowledge than lower rank. According to your question it seems you are just a beginner. Anyway it is okey to ask question moreover your question answered already by your content. However good bounty is not run too long it is just around 4 weeks or 1 @ 1/2 months then end. The distribution of token must follow base on what indicates in the campaign thread. Ofcourse provided the mission and vision of the campaign and the products.

You should find out the bounty information at icobench.com or icomarks.com. after that there is open the web official and search for information on the web, then you also read whitepaper. then you read the rule of the bounty, if you qualify continue to register

You need to read their feedbacks, their websites, social media and also the roadmap. You can join their telegram, ask about them and know their updates. For me, it's taken time to choose bounty so that you will not be scammed.

There are a lot of good ideas here and I find that the common point among you is the thoroughness in choice. I like that very much. I usually choose bounty based on the following factors:
1. Amount for bounty hunter.
2. Time to finish the campaign.
3. The number of social network followers of the project.
4. What is more important is the content and purpose of the project mean? And their team is good or not.
Thanks for reading it!

I am always looking on the team's profile to confirm if the campaign is legit then next is the product because the product will hit the marketing and will gather more investors and partnerships.

First I'll check  the purpose of the project itself. Then, the backgrounds of project team members. Then, check whom the bounty manager of the project, experienced and reputed  bounty managers will give me some confidence. And ofcourse, taking a look on the number of participants. More participants means more people will promote the project  and will have a high possibilty of succes.  I am not joining at the beginning of the campaign, mostly at the middle in order for me to review if the team are active and project is going through.

its difficult to choose the best bounty. sometimes its look great but at the end its scam or maybe have cheap price. so it will be long live on wallet. sometimes ordinary ico make great step and be successfull at the end.
i look up at the manager, and dont forget about platform what they bring