A: Zion Builder is Faster both in front end and backend and it will make your website load faster, it brings more building flexibility, has better foundation to build upon, generates cleaner code.

But the best way to see the differences if you are an elementor user is to try both builders yourself because there are many other differences.

I would suggest trying the beta version here https://zionbuilder.io/improving-ui-ux/ because the UI was improved.