HN doesn't try to be everything to everyone like Reddit tries, and the moderation methods employed here are a lot less heavy-handed and take a few offenses before someone gets a meaningful ban or silencing.
IMHO, the signal-to-noise here is amazing; not perfect, but _so_ much better. If I really want memes or jokes, I'll go back to reddit (and I occasionally do if I want some mindless downtime). I get a lot more insightful information and community interaction here than there.
I remember a while back when /r/cfb was invited to join the front page and there was considerable pushback from members who were afraid the reddit-wide readership would ruin the quality of posts. Kind of an eternal september thing...
The karma loss limit of six per comment is also helpful - on reddit you may be hesitant to break with generally expressed opinions over how drastically it can drain your comment - here the two options are -6 or banned (if you're really spewing hate speech).
Also, a shout out to dang for remaining very good at not interfering except when it's really warranted and then shutting things down quick.
I think you many 'any given Reddit subreddit', which is very true.
To others comments below: the signal to noise ratio here on HN is pretty good, and the average S/N on Reddit is pretty poor, but some subs over there are exceptional. For instance, https://old.reddit.com/r/askhistorians
I've been using Reddit for 10 years now. I still mechanically go the comment section when I come across something interesting to find the link to the source. It's never there anymore. No intelligent discussions. No pointing out the obvious fakes and advertisements/astroturfing. People write long, idiotically fake posts just to get upvoted, to either farm karma or because they're children.
Unfortunately with HN getting slowly flooded as well, I don't know where else to turn for an online news aggregator/discussion platform that fits my demographic.