I really think it is better to wait. Sometimes you get paid and forget and are pleasantly surprised with a good return. This happens most of the time within months after receiving the tokens. I don't sell when I first receive them if it is not much money or I believe it can become more valuable.
I am also waiting to sell for a very simple set of reasons. First, I am lazy, and the few bucks of tens of bucks that I would get from an airdrop are not worth the effort to run to sell them on Ether Delta, which is a pain in the ass to use. Second: the real win you have when among 99& of airdropped shitcoins you happen to get also an unexpected gem which however will need time to grow its value. So, better wait.
BTW which is the token which you mention has risen more than 500% in 3 months?