When comparing Scratch vs Phaser, the Slant community recommends Phaser for most people. In the question“What are the best game engines for point & click adventure games?” Phaser is ranked 17th while Scratch is ranked 45th. The most important reason people chose Phaser is:
Phaser keeps things simple and as such is easy to use by beginners.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Visual
Code is represented as visual building blocks that makes it easy to understand how a program is put together.
Pro Great starting point for kids
Scratch was developed specifically for kids ages 8 and up as an exciting way to introduce them to technology. It's designed to be easy to learn, but still provides good depth in computational thinking.

Pro Easy to learn
Scratch is designed to teach computational thinking rather than focus on specific syntax. It was designed specifically to be easy to learn for anyone over the age of 8.
Pro Highly structured
The language is highly structured. Therefore, it gives you the essentials of how to think like a programmer and teaches you good programming practices from early on, so you could write clean, working and readable code in the future.

Pro No need to be able to type

Pro Can be used to create games
Pro Beginner-friendly
Phaser keeps things simple and as such is easy to use by beginners.
Pro 1000s of examples
Thousands of example are on the Phaser website, which show everything you could want to do with Phaser.
Pro Supports WebGL with canvas fallback
If WebGL is unavailable, Phaser automatically switches to HTML5 canvas.
Pro Targets mobile browsers
Built specifically for mobile web browsers.
Cons
Con For kids
For kids.
Con Won't get you a job
Scratch is not a language used in the workplace. Instead it teaches computational thinking, helping to create a foundation to aid in learning other languages.
Con Does not teach you programming
Learning Scratch might help you if you have high difficulty with logical thinking. However, starting with a proper programming language, especially an easy one, will give you the benefits of starting with something like Scratch and everything else.
Con Strange OOP
Scratch has a very strange implementation of OOP that is sprite based, and will become very confusing when you move to other languages.
Con Weird
It's straight up weird.
Con Missing accessibility features
While not a big issue, it may be a dealbreaker for some.
Con Poor code structure
There's little in terms of cohesiveness in classes, methods or patterns.
