One thing that stands out to me is lemmy has public modlogs[1], this is a great feature in my opinion. Something that should be more common. Quite a few people on reddit are frustrated by how opaque moderation is, but looking at the meta community of power users that seems to mod the bigger subs, I doubt the devs will ever copy this feature. [1]: https://dev.lemmy.ml/modlog
Many mods of popular subreddits abuse their power and enforce their world views on redditors. This is only possible because reddit admins don't care. That's why there is so much drama now and again when mods will wholesale-ban or delete legitimate content that doesn't break the rules and they just won't respond to questions. Or even worse - they respond by taunting the redditors who would like to know the reason behind the decision.
I was banned from a large sub for linking to statistics on official government website to help support my argument. This happens all the time on reddit.
And it's not like it's only my experience. Ask anyone on reddit what they think of mods and you'll hear the same story.