What is the best MVC stack to build mobile-friendly, light-weight, and fast single-page application with Spring Boot as back-end (Java)? Is Bootstrap still required to front-end layer these days?
The idea is to host on-premise initially with the potential to move to the cloud. Which combo would have minimal developer ramp-up time and low long-term maintenance costs (BAU support)?
React might be a good option if you're considering a mobile app for the future, because of react native. Although, Vue.js has the easiest learning curve and offers a better developer ramp-up time. Vue.js is great to build SPAs, very clean and organized and you won't have a lot of long-term maintenance problems (like AngularJS, for example). Bootstrap can still be used, but with flexbox there's no need anymore.
I recommend React because of less memory occupant compare to Angular, but this will depend on your organisation flexibility. When you use React you need to import different libraries as per your need. On the other side angular is a complete framework.
Performance-wise I vote for react js as it loads up quickly and lighter on the mobile. You can make good PWA with SSR as well.