Lemm.ee best instance, lemmy.world worst instance.
It doesn't matter how many communities an instance hosts since you can interact with any community on any instance (barring any defederation). Lemm.ee's strength is in being a fast, reliable instance with the best admin.
I never thought Reddit was addictive. I actually spend more time on Lemmy in a day than I did on Reddit. My browsing habits changed though. Reddit is so big I only looked at a few niche subreddits. Lemmy being much smaller I view a much wider range of topics. It's a different and better experience for me.