.onion: - free, no periodic fees for the registry entry - natural content quality metric, if people do bother to download&run TBB or at least use some public

.onion: - free, no periodic fees for the registry entry - natural content quality metric, if people do bother to download&run TBB or at least use some public www->onion gateway, not to mention writing down/remembering the address - easy to self-host in a variety of conditions