In my opinion airdrop is the best way to distribute coins and I had great experience with DeepOnion. Their airdrop is now on week 34 out of 40 and all the time their devs are adding new great features. ANy day now they will publish the Android Mobile Wallet which is being tested now.

If you want you can have a look on their community forum on https://deeponion.org/community/ and if you only want to know about the airdrop go to https://deeponion.org/airdrop.html.