I use Reddit for 2 main purposes. As a distraction with a diverse home page curated to my interests: It was nice to scroll through and have a mixture of memes, art, text posts and news all in one place mixed together. Secondly if you want advice for a hobby/interest there is usually a subreddit for it where you can have a decent discussion.

I've spent a small amount of time on here an kbin so far and both look pretty promising (especially since they should have the same content once the federation on kbin is sorted), if they're active enough I can see one of them mostly replacing Reddit for me even if I'm not sure the main userbase will ever switch. The main thing I'm waiting for now is a decent iOS app, I'll probably use whichever platform gets one first!