depends on what you mean by accessible - i assume you don't mean accessibility (for blind/disabled people), but ease of access.
HN is way more easily accessed by someone. You are not nagged by a dialog to get you to download the mobile app. HN has way less clutter in their UX (even compared to old.reddit.com). HN has fewer call to action in the UX to do things like submit, vote etc.
Compared to specialized sub reddits, HN is huge. I find the content to be generally extremely accessible. Of course, there are some specialized subjects and links to research papers few will understand. But even for those, if you ask nicely, there will be a kind soul who will try to explain.
depends on what you mean by accessible - i assume you don't mean accessibility (for blind/disabled people), but ease of access.
HN is way more easily accessed by someone. You are not nagged by a dialog to get you to download the mobile app. HN has way less clutter in their UX (even compared to old.reddit.com). HN has fewer call to action in the UX to do things like submit, vote etc.