Due in part to the excellent UI and user-friendly reading experience, both on that mobile app and in a browser on my laptop, HN is the site I visit most often every day for a pleasant break to learn new things.

Reddit on the other hand is something I look at maybe once a month, where I'm reminded each time it's disorienting and hard work to use, so it's not somewhere I go to enjoy a calm read. So for me Reddit is just for finding specific information from a search result then leaving.

The Reddit UI has a lot to do with that. It ties to the "randomness" of the content. HN content also has randomness but because of its UI you can skim a lot in seconds so it's easier to pick out things of interest with low stress and just enjoy them.

Typically I glance through the top 100 to 150 headlines of HN to pick a few of interest, several times a day. It takes about 10-20 seconds to read those headlines, and to know I'm done - which is very different from scrolling-oriented sites which deprive the reader of perspective. I can see how this might be different for people who cannot skim text quickly or who find that difficult, or who are trained to infiniscroll through things showing only a tiny number of large cards on the screen at a time. The latter is how you destroy perspective.