Spring MVC is servlet-based and typically uses one thread per request; it’s great for most CRUD apps and works well with blocking libraries. WebFlux is reactive and non-blocking, which can help with high concurrency and streaming—if your whole stack is non-blocking. Using WebFlux with blocking calls often removes its benefits.
Expanding on the short answer — what usually matters in practice:
A tiny example (an explanation template):
// Example: discuss trade-offs for "spring-mvc-vs-webflux---what's-the-real-differen"
function explain() {
// Start from the core idea:
// Spring MVC is servlet-based and typically uses one thread per request; it’s great for most
}