An ICO supports the development of your coin. If you have enough to support your developers (salaries, rent, coffee, ...etc.) then you have a choice of ICO and Airdrop. Keep in mind that your coin must have new features that attract investors. ICOs usually need to provide enough evidence that you will be standing by your coin. Get to speak with some investors to support your coin and when you announce your coin, make sure the mention the investors names because this will attract more smaller investors.

If you don't need investors support, you can go with an AirDrop, but your coin must be highly lucrative (future development, features and distinguished characteristics) to attract the public into joining your airdrop. If you want to create a coin for the fun of it, do it. But, keep in mind that there are many meme coins that are floating dead.