I have to heavily disagree with this. Reddit content is way better in both quality and quantity. The only thing worse is maybe the Signal to noise ratio, and even that is questionable. For example, askHistorians is a gem. Many subreddits are very useful. Moreover, for many questions, I find myself adding "reddit" on google. Not once have I needed it to find useful content on hacker news.
I do it more out of necessity than because reddit is a good site. You get into a niche enough subject and your choice is either a small subreddit or delving into the artifacts of the early internet like GameFaqs, Deviant Art, or some new site forums (the ones that still exist). I Still need to take a grain of salt and check if the redditor isn't blowing hot air or isn't on some unhinged rant.
HN is great but focused on very specific, technical contetnt. Not gonna be much oppurtunity to talk about media or craft hobbies here.
Ask about anything remotely controversial, and you'll see how quickly it's an echo chamber.