Tbh they aren't really different concepts, despite the apparent dichotomy we are given in liberal Western education. If ideal Communism were actually possible, it would be true Democracy* - just with specific economic decisions. It doesn't matter whether it's the Politburo or a democratic vote of your neighbors deciding that your farm is everybody's farm.

(*Yes obviously non-democratic systems of power can be socialist. Many such cases...)

Tbh they aren't really different concepts, despite the apparent dichotomy we are given in liberal Western education. If ideal Communism were actually possible, it would be true Democracy - just with specific economic decisions. It doesn't matter whether it's the Politburo or a democratic vote of your neighbors deciding that your farm is everybody's farm.