React vs Underscore

I find using Vue.js to be easier (more concise / less boilerplate) and more intuitive than writing React. However, there are a lot more readily available React components that I can just plug into my projects. I'm debating whether to use Vue.js or React for an upcoming project that I'm going to use to help teach a friend how to build an interactive frontend. Which would you recommend I use?

Simple datepickers are cumbersome. For such a simple data input, I feel like it takes far too much effort. Ideally, the native input[type="date"] would just work like it does on FF and Chrome, but Safari and Edge don't handle it properly. So I'm left either having a diverging experience based on the browser or I need to choose a library to implement a datepicker since users aren't good at inputing formatted strings.

For React alone there are tons of examples to use https://reactjsexample.com/tag/date/. And then of course there's the bootstrap datepicker (https://bootstrap-datepicker.readthedocs.io/en/latest/), jQueryUI calendar picker, https://github.com/flatpickr/flatpickr, and many more.

How do you recommend going about handling date and time inputs? And then there's always moment.js, but I've observed some users getting stuck when presented with a blank text field. I'm curious to hear what's worked well for people...

Preact offers an API which is extremely similar to React's for less than 10% of its size (and createElement is renamed to h, which makes the overall bundle a lot smaller). Although it is less compatible with other libraries than the latter (and its ecosystem is nowhere as developed), this is generally not a problem as Preact exposes the preact/compat API, which can be used as an alias both for React and ReactDOM and allows for the use of libraries which would otherwise just be compatible with React.