I've worked with React before, and the thing that strikes me about Svelte is how intuitive it is to use. If you come from a background of knowing Javascript, CSS, and HTML, you can just write in those languages, and Svelte sort of takes care of the rest.
The other thing is it tends to be quite a bit faster than React since it does more calculations in the compile/build step, rather than when the user actually accesses the website or app.
Give it a go, it is different, but once you get used to it, it feels very lightweight and flexible (in a good way).