There is not really one solution - you need to answer some specific needs to help determine the best fit.

What do you want as output?

Do you want it web based?

Do you want it to run on which platforms? (important if it's iOS and Android)

Are there any language specific features you want to use? (i.e. mapping may want to use PostreSQL)

What devices do you want it to run on? and are those devices disconnected from the internet?

Game oriented (high-end gaming?)?

User-Friendly to install.update?

Integrates with say Microsoft AD?

Open source with a large potential community?

These answers will help whittle down the choices. One language might do most of that stuff but not as good as picking the right tools for the job. (which also includes the ones you really like to work with - which is a major point)

Then pick one and start - If it doesn't work out, switch. One of my favorite mantras: "stop shopping - start doing".