My answer is of limited value since I don't vote except in unusual circumstances.
I've read the question repeatedly, but the subjective terms in the title distract me from the attempts to define the terms within the question. The title sets the expectation that the question will be an exploration of subjective opinion and that conditions how I read the question. (I believe the title is or should be the question and the question should be the title). Looking over the edit history it appears that you have done substantial work to demonstrate preliminary research and to try to define the terms, but I'm not sure that the terms are defined in a way that will support an authoritative answer. I might suggest:
Why did Russia de-Stalinize while Romania started a personality cult around Ceaușescu?
The term "my premise" can also be a danger signal. Unfortunately while that term is used by people who have thought long and hard, done research formulated a premise, stated it formally, subjected it to initial tests and then revealed it to the world for acid testing, the same phrase is used by people who have done none of those things. The first type of question is interesting and worthy of effort; the second is none of those things. Gresham's law as applied to information causes us to assume that the second is true unless we see evidence of the first.
I might suggest (I admit that I haven't thought this through deeply this is off the top of my head
Soviet leaders seemed to alternate between progressive and regressive policy. From Stalin's purges to Khrushchev's thaw, from Brezhnev's freeze to Gorbachev's openness... and then a coup to try and stop Gorbachev.
The general character of repressive policy became less severe each time. Brezhnev's repression never went as far as Stalin's, and Andropov's rule included the first publication of economic facts and anti-corruption efforts. Furthermore, each time liberalization went further than it had before. This does suggest a slow but continual liberalization since the death of Stalin and appointment of Khrushchev.
If it were possible to support these conclusions with evidence (Can you cite a summary of the Brezhnev freeze vs Gorbachev's openness?) that would go a long way to conveying the amount of thought in the question.
The question is hard; the answer may not be known and if it is known, it may require a book length answer. There are ways for H:SE to provide answers in those cases, but it is difficult.