Vue is much, much faster to load; it is possible to use vue applications over 3G where React apps choke. Vue is also, in my experience, much easier for back-end developers to contribute to without making app-braking performance mistakes. It has a canonical event-driven store, Vuex, with much nicer debugging tools than any of the flux frameworks (it includes getter values, for example). I have also found the error messages more meaningful across the ecosystem; React can sometimes produce very unhelpful errors.

What it lacks is some of the maturity. For example, dynamic loading of assets only works if they are static and the cli isn't trivially deplorable. It is also less standard among front-end developers, which mostly comes through in the selection of libraries available (Vue is close enough to vanilla templating that the learning curve is shallow.)