its better to join in bounty  not like wasting your time in airdrop .Most of this are shitcoin or doesnt reflect to your erc20(myetherwallet) based on my experienced, I work hard to rrgister ico like 80 airdrop only 7 appears to my wallet 6 of this are shitcoin .My advice in looking for good ico's bounty find icos that they will pay you weekly directly to your erc20 or btc wallet(some bounty also reward btc but its very hard to find this kind of bounty)