Usually you earn tokens worth very little with airdrops (but you don't need to do actual work). Bounties it depends, I have earned very little sometimes (worthless) or I have been pleasingly surprised with more than USD 500 worth of tokens. I only do bounties for projects I like and invest myself, it is a way to earn more tokens you like on top of your investment, like the cream on top of the pie.
I have the same thought with you. I do bounties more than airdrops since bounties are usually done in projects and this could earn better than anything. However, waiting for it is a little way beyond how we think of the waiting time of earning in bitcoin. Bounty takes more time but it is worth it.