Bounty campaign on my experience is better than airdrop. I received some tokens from aidrop campaign however it doenst have value. In my observation, airdrop drastically change from last year. Before tokens from airdrop was a really good money, you can get a huge profit in airdrop alone.
On the other hand, bounty campaign is a great experience because you can learn more about cryptocurrency in this forum, at the same time you can earn a good token.