It depends on how long you want to live in Pattaya, condos are difficult to move on as they become older and more so ones at the lower end of the market, there is a glut of them in Pattaya, certainly not an investment you would make money on if you tried to sell it at a later date.
Put your money into a high interest savings account and use part/interest/interest to pay rent with the option of moving on if you want to.