When we talk of bounty hunters, we talk of any means possible to get paid for little to huge task rendered within a period of time. Airdrop does not give you a straight hit at a time, and if you get lucky to participate in some good projects, you'll rejoice when the price increase and profits attained. In bounties, its almost the same thing with airdrop if the project is not a success. But if the project is a success, the profit will be worth all the time given. In the crypto world, both airdrops and bounty campaigns are for earnings and both can help very well if added together. Bounty is more profitable than airdrop, no two ways about it.