To get a good bounty, you should atleast read the whitepaper and visit their website. You can see their some very important details, facts or information. Then after reading, you will know if it is successful or not. If it has a potential or none. Trust your instincts. Dont focus on time. Focue on what are the capabilities of that bounty.
There are a lot of bounties to choose from but choosing the best that you think can help you grow as individual and whom you can trust throughout the campaign. Its better you study about the bounty's project and weigh what project do you think suits your capability.