Both ways is profitable but it does not give us an assurance on earning. We also need to find a good bounty and airdrop here in the forum that we could support so in the long run it would be successful in results for our earning. It does not matter if we choose to support bounty or airdrop because we could support both at the same time.
I think most of us will have the same opinion about this because mostly have similar experience. For me i will choose the bounty since they can earn a lot on free distribution and your earnings will be scanty, but the decision to take you that is better for you.