The Communists. Would you rather live in North or South Korea?
Vietnam is interesting in that they're still politically authoritarian but willing to be more economically open; see also China. (Just don't say the wrong thing about the wrong people.)
Today obviously the South. In 1950, probably the North. Throughout the Korean war, it's a wash. The US obliterated the north, but the south was completely insane towards their own civilian population. The ROK was not a "nice" government to live under during the korean war.
If you lived in the north there was a good possibility that you were getting bombed. It was best to live near china.
If you live in the south, there was a good chance you would be conscripted and sent to the meat grinder as a man.
The subsequent cease fire, the south has rebuilt and become the better place to live. The north has mostly struggled due to international sanctions. They have never fully recovered.
"The Communist" were a faction in a civil war, that's not an invasion. And the split in both cases (Vietnam and Korea) was recent and artificial, in the sense of no tradition of there being two countries. It wasn't one country invading another country, but two halves engaged in a civil war.
Where one wants to live is irrelevant. It wasn't about stopping an invasion, which was the initial claim. The US was meddling.
The Communists. Would you rather live in North or South Korea?
Vietnam is interesting in that they're still politically authoritarian but willing to be more economically open; see also China. (Just don't say the wrong thing about the wrong people.)