Well that depends a bit on what the MVP needs to be. Anything web related I'm probably going the Elixir/Phoenix route. I'm no web dev, but this combination makes me actually kind of like doing web-things with how batteries included it is, and the tools it provides to really jump start a project. Then I'd host it "old schoolish" in a VPS or similar since that's what I know best. Might consider being fancy and investig…
Real time? Need to go distributed? Maximize # of features / developer bandwidth? Cutting edge machine learning training & model serving?
Mobile? JSON APIs and GraphQL tooling is great, but https://github.com/liveviewnative is moving fast so this stack almost has the exodia of full stack, one language, and distributed actor model based scalability.