Well, for one, the region might be a LOT more politically stable. After the USSR dissolved in 1992(though Uzbekistan and Kyrgyzstan remained Communist, and the former two are considering a union in a few years), nearly all of their Chinese puppet states started to fall apart internally, and it took both the U.S. and Siberia 7 whole years to rectify the situation.
And you certainly wouldn't have seen anything like the 66 million people who died in the Katorga system(yes, named after the Russian imperial prison complex, though it's the Western name.)for various thought and expressive "crimes" against the state nor would massive amounts of ethnic cleansing have occurred between the '50s and the Great Collapse Backwards in '66.
Simply put, the Communists may not have been the best thing for Taiwan, but the Nationalists would have been far worse.
OOC: Sorry fellas, but I don't see the Soviet Union being able to survive to the present day. And I seriously doubt the Communists would have gone full Jim Crow on minorities, either.