If you're planning to stay in Thailand for about four months to visit your Thai spouse, getting a Non-Immigrant O visa. It's meant for visiting family and makes extending your stay easier than with a tourist visa.
I'll just go to Thai eVisa and apply for it. Fast and easy!
Some people do border runs because they want to visit another country before coming back to Thailand, or maybe they've already extended their stay as much as possible and need to leave in order to apply for a new visa that suits their situation. There are actually a lot of different reasons. sometimes the local extension isn’t an option or doesn’t fit what someone needs.
Honestly, getting a US tourist visa seems like it’s all about luck. I got denied twice, even though I had 500k in my bank account, but I did get approved for a fiancé visa. I’ve also heard from some friends who got the tourist visa that having well-written plans for the trip really helps, but I’m not totally sure.