[torrefy]

For overall singing, Illusion stands out by far. Then Aura. After that, maybe some singers from Icon/Ion or V6 for thai songs. Except the better ones in Icon/Ion are not always working, because they are engaged in AliExchange, so they get priority to do that instead. V6 maybe you get to hear one every now and then but they don't have many solos or none at all, so they get drowned out by the rest of the singers.

If not so focused on Thai songs, Illusion, Aura and D9 are probably the better ones. Then the same old Icon/Ion/V6. Don't think other clubs are that great.