The top comment on reddit is always a stupid fucking joke or pun. Not so on lemmy. That's the biggest difference I notice when I go back to look at reddit. On popular posts the whole first 3 threads are inane bullshit.
Like the inside jokes were really good on Reddit like the switcheroo one, or the guy that always had that whole comment that ended in the wrestling scene but most of them were just repeated to death
Main difference from reddit is that you don't see the same joke repeated in every thread. And here if you comment something it'll probably be read by at least a few people.
Here, your comment doesn't get completely buried if you make one on a popular post. Part of that is the lack of heavy volume, of course, but I also feel like the sorting is more favorable to less upvoted comments.