As far as I am concerned, most of the airdrop tokens do not normally have value in the market hence, I will prefer to sell them immediately. I can't hold airdrop tokens for long. The moment I get my airdrop tokens, I will quickly sell it at whatever price the listing of it comes with. I focus less on airdrops but focus much on bounty. As a matter of fact, there were times I have been given airdrop tokens that are not listed in the market at all. So for this reason, if I get tokens from airdrop, I will sell immediately it is listed.