I would argue that it was neither. It was a deviation towards far less competent leadership. In my opinion, the main lesson of USSR is that you really have to make sure there are strong selection mechanisms within the system that ensure competent people rise to the top. This is where China does a far better job incidentally. I did a deep dive on that here if you’re interested https://dialecticaldispatches.substack.com/p/rethinking-governance-through-outcomes