No License, No KYC casinos are my favorites.
License means regulations, regulations means problems. Why would a casino need a license? The only thing a casino needs is a good reputation and it only takes some time to build it. freebitco.in is a very good example.
If I can't access to a casino like this, of course my second favorites are Licensed/No KYC casinos.
Probably a problem for some gamblers where if a casino have license means that some gamblers from a country where gambling is illegal so it really is a pain in the ass. It's just like the casino where I came across where the country where I'm from is in the list of countries that are blocked or illegal them that means if a gambler from that country gambled big time then request a cash out and the casino ask for KYC then that gamble would surely won't be able to cash it out due to that reason.