I think the biggest thing that I didn't really notice at first was just how Reddit 'works'. It was very much 'what you see is what you get' and didn't really take much to figure out how to use it.
With anything new though there's a learning curve and after 24 hours or so on kbin, I'm starting to figure out how this and the wider Fediverse works and it's feeling more and more like home.
Also Reddit is also 18 years old (in a few days) and has 52million+ users so there's obviously more content. As this platform grows it will be easier to get the content you want but at the moment it's going to take some work from the user to search for magazines and contribute.