long story but cliff notes is i ended up in vn because it was the least hassle for a visa.
yes, hot girls everywhere in vn. If you work as an english teacher at a small language center you're pretty much guaranteed to have at least 4 cute university aged colleagues or admin staff that you will see 5 days/nights a week, most of whom will have *okay* english, some will have annoyingly good english and won't shut the fuck up. Teaching at public schools is a bit more of a mixed bag, the teachers will be older women but often a company will give you a hot TA. I was pretty unlucky with TAs, most of mine were ugly as sin and I had a steady gf I loved very much by the time I got a hot TA who wanted my cock (literally asked me If wanted to spend the day break at a hotel to relax - aka wanted to fuck).
I wouldnt overthink it bro, asia is full of cities with 8+ million young women and its going to be much the same wherever you go. The advantage of PI is that they already speak english albeit like fucking munted retards, so its a little easier and less awkward as it often can be with the language barrier in VN.