Roman Holiday has a ton of potential if people actually showed up, it's the lowest price and no one is there so plenty of opportunity to relax but usually no one is there. Staff is mostly nonexistent in the mens area. great steam room/sauna, no hot tub worth mentioning.
Spaland - mixed group - def a lot of straight guys with their wives/gf's
Gangam is all action just not very clean. Mostly black guys, sometimes a couple asians. i never see straight guys here.
Jeju - packed with people all the time - all races, all kinds. staff can be rude/vigilant.
Qi Clay is specifically for gay men.