Why the hell would you leave Thailand in the first place?(I'd rather be in vietnam, hoever)
I've spent a lot of time and Thailand and never had a single problem.
Vietnam on the other hand is the worst country I've ever visited.
You can't even compare the two, Thailand is infinitely better, even the Thais look down on those Communists scumbags and consider it a shithole country. They fought against them too and annihilated them as well as the Communist jungle guerillas coming into Thailand.
Personally I prefer to live in the liberal yet Right Wing Nationalist and free-market Thailand than Communist shithole Vietnam.