I like that HN doesn’t give voting power to new accounts. And because it takes a while to build the points (or whatever they’re called here) to get the voting power, that time allows newcomers to see and get used to how discussions works here.

I like that Discourse only has an upvote button and no downvote, but that the replies still stay in chronological order. That way there’s an actual flow to the conversation but you can still see which ideas people value.