I'm a regular visitor to Thailand and the scene there is off the charts. In Bangkok's lower Sukhumvit area there's a bunch of ladyboy bars but the big 4 right now are the two Check-In Bars (CIB10 and CIB11), Why Not, and Cindy's Secret. On any given night between those 4 will be about 60 super hot ladyboys working. There's a few smaller bars in the area and the Go Gos in Nana Plaza and Soi Cowboy.
Pattaya is even better. In the Soi Bhuakhao area there are currently about 20 ladyboy bars stacked with talent. I think the best now are Peachy Lily's on LK, Delirious, Katoeys Are Us, and Cindy's Secret Pattaya. Just search and check out the talent. Just to name a few more, 69 Bar, Jie Jie, Meena's, Duangjai (as well as others) on Soi Chaiyapoon (Soi Pothole), New Bar, Bon Bar, Backroom, Old No 7.
On top of that is a massive freelancer scene, just check out thaifriendly. com
My extensive experience is that the ladyboys there are WAY better looking and almost universally give way better GFE/PSE service, Plus there's no 1 hour clock, and it's so cheap, like 1500-2500 baht ( less than $100) a session. I like getting to know them first in the bar. Walk into any of the bars listed above and have your choice of 15-20 on any night. Buy a drink, if you don't feel the chemistry, move on to the one giving you the look.
I don't like Phuket so I don't go but it also has a big scene. I like Chiang Mai, but the bar scene there especially for ladyboys has been there for years, but they do still have a lot of freelancers.
Philippines has a big scene too but I find the Thai ladyboys to be a lot more attractive in general, and I just like Thailand better.
Do yourself a favor and go. Feel free to PM if you want more info.