[jjcm]

Depends on what kind of project you're doing. Vue is still great for smallish projects, but if you're looking to make yourself marketable React is the way to go. For future proofing yourself, it might be worth looking into webcomponents as well. Likely there wont be anything built using them directly, but there are a bunch of new frontend frameworks that utilize them (stencil for instance). Next gen frameworks will highly likely take advantage of shadowroots and other parts of the spec under the hood, so it might be worth understanding that stuff now.

TL;DR

For resume building + career growth -> learn react

For quick and dirty side project -> use vue

For future proof / bleeding edge understanding -> use webcommponents