Gangnam was a straightforward rub&tug, no mystery, no fuss. Average girls, clean enough.
Royal Thai was dingy from day 1, always smelled, and the very rough women always acted like HE was unexpected.
I'm not shocked that they're related, but I've definitely had a lot better experience at Gangnam than at Royal (or anywhere else in St.Joe for that matter - used to be a reliable one on 36th but they've been gone a couple years.)