The USSR would span its territories in the 80s but be led by a competent Marxist leninist party. Same for the Warsaw pact countries and Yugoslavia. These were caused by revolutions popping up all across the globe and other areas.
The US choice would have itself devolve into chaos while its power and influence decreases. Infighting would break the US into pieces but territories like hawaii and alaska would gain independence. The main government would be torn asunder and the CIA rogue and unfunded.
End of the US for sure. The single most difficult material condition for any socialist society to adapt to is the existence of the US. If the US ended, there would be dozens of socialist experiments within the next 5 years.
thats my argument for the US collapse choice, the US is single-handily repressing socialism worldwide. With them gone, the world will be free.