It's not 'capitalism vs. communist dictatorship', it's 'bourgeoisie dictatorship vs. proletarian dictatorship'. If the abolition of class dictatorships is aimed at, only a communist revolution that abolishes class society can accomplish that. If not, then dictatorship is the state of affairs you want to preserve, not the communists
But there are plenty of capitalist or partially capitalist countries that aren't dictatorships. Whereas China is essentially ruled by one person. I don't accept your dichotomy either