I too prefer to use my TG miles to convert to Hotel Award stays.
Being SPG platinum, I would choose SPG hotels
In Bangkok, my preference would be :
Plaza Athenee (A Royal Le Meridien hotel)
The Westin Grande Sukhumvit
In Pattaya, it's :
Sheraton Pattaya Resort
In Phuket, I would go for :
Le Royal Meridien Phuket Yacht Club
Sheraton Grande Laguna Phuket