I made an account in both and installed their websites as pwas on my phone. For lemmy (on lemmy.world) there is a bug/feature that constantly loads new shit no matter the sorting which at first made it unusable for me.
This is supposed to be gone in 18.1 though but lemmy.world has issues upadating.
Kbin PWA does not respect orientation lock which also really grinds my gears.
So today I started looking into apps. Currently on wefwef PWA and its the best experience so far but needs more interface customisation eg thumbs on the right so I can properly take a wank and browse with one hand.