Strongest clan, not ally. It is hard to even gauge a single chinese clan power there because no one here can even tell "oh x, y, z parties are on Fun, v, a, b are on United". I'm sure they would beat a lot of clans tho, simply cuz most don't even have 4 parties.
That argument seems a bit random (specially when we are talking about different timezone clans, they cant touch us, we cant touch them in respective primes) and with some heavy assumptions on what OP wants to know. The way i see the question, i imagine the clans in full power. Basically SM > Perkunas (unless their CPs just broke and i don't know about it, cuz if we are talking about vacations only they should still be named) > rest. I'm not even sure TFD/Terror can beat ES/Anarchy. When i log cams i tend to see ES farming heart, not tfd. ES gets most night epics too. So where exactly is this TFD strenght on a daily basis ? But whatever, gonna leave video of an open field fight 4parties vs TFD + Terroristas and let OP take his conclusions.