the fastest way is to have both. the more airdrops you have the more chances of getting legit coins without working for long hours and it can be mutually done while having bounty campaigns.
how much we earn from airdrop and bounty? well we cant state specific figures because it depends on how the project was going if it fails then the rewards from both airdrop and bounty will be no value.
if the project succeeds, then the market will decide how much each token cost.