Is it better to buy or rent property in Thailand as an expat?

ROI ???

Do you plan on living at condo till your end of days ?   If not rent.  Dependent on age, finances, and how long you've been or know TH.

Rent at any condo you consider buying at for a year also, before buying.

I know a few expats who bought thinking they’d make money, but it didn’t always work out. Condos can be tough to sell, and the market doesn’t always go up the way you’d hope.
If it’s for long-term living and you’re done with paying rent, it could make sense. Just know there’s work involved if you plan to rent it out—finding tenants, dealing with repairs, all that stuff. Back home, I’ve used valleymanagementgroupinc.com for my rentals, and it saved me a ton of hassle.