No it wasn't, at it's peak, USSR was only half of US GDP and was never a trading/manufacturing powerhouse.Communist GDP of USSR was also massive and in 1 year out all went down the drain in 1991
Free and open markets with population stability are more safe then communist regimes
Communist regimes go up fast and come back down quickly
its a self destructing form of governance
which is why small nations like UK which are united can achieve way above their weight
China is ahead of US in PPP and getting closer on the nominal basis.