With a PoD after 1924:
Would it A, be possible for Stalin to industrialize Russia to similar levels as historical without forced collectivization?
And B, would it be possible for Stalin not to purge the Army in the 30s? If he did not, would he be removed by the army?
If you can somehow butterfly away those two big mistakes but keep the rest of his evil and cruelty, how would he be remembered today?
How would WW2 and it's outcome be impacted?