It depends on what I'm trying to accomplish. If I'm trying to build something quick to prove that there are interested people out there I use a static html pag

It depends on what I'm trying to accomplish. If I'm trying to build something quick to prove that there are interested people out there I use a static html page with JQuery and Form Gadget (https://www.formgadget.com/ https://www.formgadget.com/) to handle form submissions and integrations. Sometimes this is enough even for the product depending on what it is. If it's something that includes a subscription model, etc, then I like Akka Http (Scala), Slick, JQuery or React + Redux. More importantly though go with what you know well and can make progress in quickly, unless you want to learn something new. Disclosure: I built Form Gadget.