I prefer LitElement; no reinventing of the wheel like JSX etc. do and no build required. Plus you get browser supported CSS scoping and life cycle support.
I didn't go full LitElement because I didn't want to add build steps (I'm waiting till they figure out ES6 module path resolution) but I found that the templating/rendering library LitHTML is great and easy to seamlessly and incrementally integrate in any webapp. It's just plain html, it's very fast and it just works. Javascript literal templates are a very elegant solution, turning strings and statements into lists of objects which can be efficiently cached, diffed and recursively traversed a la Lisp. To me JSX felt like a crutch to compensate for browsers being behind the curve. We no longer need a second html.
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