When comparing Ren'Py vs Phaser, the Slant community recommends Ren'Py for most people. In the question“What are the best game engines for point & click adventure games?” Ren'Py is ranked 7th while Phaser is ranked 17th. The most important reason people chose Ren'Py is:
Available on Windows, Linux, OSX, iOS and Android.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Cross-platform
Available on Windows, Linux, OSX, iOS and Android.
Pro Active and friendly community
Pro Reasonably good at creating puzzle and point-and-click 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 Not for every genre
While technically capable of creating 2D games in any genre, Ren'Py excels in creating visual novels and has a reasonable feature set for creating puzzle and point-and-click games. Other genres are best tackled by other engines.
Con Outdated Documentation and official built-in tutorials
Unfortunately, you will have to hunt relevant info on how Ren'py script works. The Ren'Py dev has the working tutorials on his Patreon, other than that you might as well just code in Python.
Con Requires knowledge of Python to use
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.