HN is fine on desktop but I don't really enjoy it on mobile much. Tiny tap targets, font sizes and spacing seem a bit "off", etc, and so I use a third party client.
Have similar feelings about old reddit on mobile.
What it comes down to is that yeah they're better than new reddit, but that's not much of a bar to clear and if I'm going to be spending extended periods of time using a site/service the experience needs to be good not just passable.