Now, Kruschev and the rest of the politburo certainly didn't want to be led by Beria -- they knew Beria was a monster and would eat them alive, so Beria had to go. Of course, if Kruschev had meant to be an uber monster himself once in power, Beria would still have had to go. There's no two ways about it: monsters have to take the competition down.
Beria had less than four months in power, so it's hard to judge how it would have gone from there had he stayed in power as long as Kruschev.
All I know is they were all monsters. Stalin had seen to it that they so be -- they all had to have skin in the game to protect Stalin.