[jjcm]

Personally I prefer a mix of both. For reusable components, I prefer inline styles. These are things that shouldn't be mutable without creating an exception to the design language. For basic page layout, standard stylesheets all the way. I shouldn't have to know react to make a marketing page that has nothing dynamic on it, but I'd still like to be able to reuse existing components on that page easily.

Recently I've been using webcomponents a lot for this, mainly because it makes the code accessible for those who don't know javascript and don't have an environment set up - just load the script at the top of the page and you can use <my-component> wherever you want in the html with the styling/functionality already taken care of. With those in place anyone can update a css file to lay things out appropriately.