I use a mixture of Clip Studio and Photoshop. Just finally pulled the trigger on CSP during 2020's black friday sale, and glad I did! It does ineed have tons of useful features, and the webtoon exporting feature added in December is super useful for lots of things
Buuuut there are a number of things that I'm either too used to or that don't exist in CSP that still have me using Photoshop for parts of my process. Lettering is one, certain layer styles and effects are another. And even some simple things like Clip Studio lacking a "drag a copy of the selection on the same layer" option. It's frustrating to have to copy a selection to a new layer, drag/mirror it into place, and then re-merge the two layers every time
But like lots of other things, CSP is king. From the coloring tools, to perspective grids, to easy timelapses.
In short I like both programs~