bounty programs is a lot more better than airdrops in terms of profit but on the side of the company airdrops tend to have a bigger participants and gaining a lot of attention but that's what makes it hard to earn decently on airdrops not to mention that some coins from airdrops becomes a dumping coin once it reaches exchange.
reward is better in bounties but at the same time they need regular work from us .
airdrops only need one time promotion like tweeting for them or sharing on fb .