Can always change the cities HH vs Da Nang, or whatever pleases.

https://www.numbeo.com/cost-of-living/c ... +Minh+City
Overall, HCM cheaper than BKK. Cost not the only factor to consider. Like the infrastructure here, roadways as excellent. Electric & water service could be better, and sewage management stinks of course. Healthcare is excellent, affordable & accessible.
I personally wouldn't leave Thailand for another SEA country. Top choice would have been Nam & PI, but same reason I didn't retire in FL, USA, typhoons blowing by all the time.
Rooted here with wife & daughter, though after house sold, nothing keeping us here, and if leaving, it would be somewhere in the Americas. Too old (relative / 65), but more so, too lazy to move again.

Unless daughter gets an international job, out of Thailand, then probably would, depending where she went. But that's highly unlikely.
Looking at the specifics, under the screenshot, not much of the savings would pertain to us. We eat in, way more than out, and very lite alcohol sippers.
Groceries, save maybe 30 %, maybe few thousand baht a month
Electric would be a savings, same, few thousand baht a month, as I do abuse the AC, but overall 5 - 10 k baht a month.
Certainly not worth leaving for, especially since yearly visa ext. are too easy here, along with knowing the healthcare system, if I ever need.