Fewer bots. That and fewer users are literally the only (social) differences, sorry if you're all trying to cope that lemmy is somehow superior in every way
I dunno man. How can you be sure the comments you're seeing on reddit are from bots? There are some bots, but there are also a lot of ignorant mfers on that site.
I would also say that Lemmy is much better moderated, partially because it's still small enough that the mods and admins can stay on top of everything. Reddit is so chaotic that absolutely horrific comments and threads tend to slip through the cracks quite regularly nowadays.
It's superior in a major way however. The ability to essentially pick the set of admins you're happy with is a game-changer (and yes, you can always selfhost).