I use my laptop 55% of the time, phone 25%, and tablet 20% (don't have a desktop specifically). Whenever I'm at home I barely use my phone beyond listening to music and podcasts. I just like having a big screen, so I only really use my phone when I'm not home.
In terms of Kbin itself, I used Reddit half and half between mobile and PC but mostly scroll Kbin on desktop since there aren't any dedicated apps for it yet. Hoping the API comes out soon, the web interface on mobile is great but nothing is as cohesive as an installed app.