One thing I really like about Lemmys small size is how posts can remain relevant for some time. It's very laid back for a social media. You can have discussions that last for days on Lemmy, and there's no need to constantly update or FOMO if you don't check in for awhile.

Reddit is far too busy. There's just a constant sea of noise. It's practically pure luck if a post gets noticed, and if you don't comment early then you comment is basically lost. For the most part content on reddit loses all relivence within 12-24 hours, and having any real place within the community requires constant engagement.