I didn’t find any particularly interesting or meaningful differences.
At the template level, JSX exposes more plain old JavaScript than Vue’s templates do. I find defining and using types in JSX land more intuitive. Otherwise they’re fundamentally both excellent and very capable and neither is doing any one thing glaringly wrong.
I ended up scrapping it because the deeper I went, the less interesting it got. I think it really does come down to ergonomics and preferences
Vue: rendering output defined primarily with templates and attributes like `v-for`; Single-File Components structure, lets you define styles as CSS and I _think_ they get scoped automatically; all major libs for routing, state management, etc, are considered "official" Vue packages and have at least some intentional coordination; probably less ecosystem churn overall due to those "official" packages; possibly easier to get started with, since it's easier to drop in one script tag and use it as a small enhancement to an existing page; reactive data UI for updating state (`state.value = 123` auto-triggers UI updates of components that rely on that data).
React: JSX syntax for rendering logic ("It's just JS!"); no official structure for defining component files/folders/logic; React is still "just a rendering lib/framework", so all other capabilities (routing/state management) are filled in with community maintained packages (React Router, Redux, etc); _dozens_ of community packages for any conceivable use case, but plenty of churn as a result; _can_ be used with just a couple script tags, but in practice normally used with a full JS build toolchain; explicit `setState(newValue)` API for triggering re-renders, and renders many components by default - have to intentionally optimize components to avoid unnecessary re-renders.
React is the definition of an overcomplicated codebase + its model is wasteful and re-renders too much by default.
It's the least ergonomic framework which became popular I've ever seen in my entire career.
A pure case of resume driven project getting popular in some FANG and then being shoved down the throat of developers everywhere because cargo culting.