When comparing Raphael vs Snap.svg, the Slant community recommends Raphael for most people. In the question“What are the best JavaScript drawing libraries?” Raphael is ranked 5th while Snap.svg is ranked 7th. The most important reason people chose Raphael is:
Because Raphael supports rendering VML + SVG, it is one of the few drawing libraries that is backwards compatible with older browsers that do not support canvas.
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Pros
Pro Works with older browsers
Because Raphael supports rendering VML + SVG, it is one of the few drawing libraries that is backwards compatible with older browsers that do not support canvas.
Pro Built in animations
Several built-in animations (such as ways of easing) are provided for you out of the box, but Raphael also allows cubic beziers for more complicated easing functions. Any drawing object property can be modified making it similar to css animations in jQuery.
Pro Every object is interactive with events
Everything that is drawn in Raphael is an object which means it is easy to manipulate any part of the rendered image after it is processed. It uses an event handler system for user inputs which makes it easy to learn for JavaScript developers used to event based libraries.
This style of handling objects makes Raphael a good fit for rendering interactive diagrams and charts that can also interact with other parts of the page.
Pro Easy creation of charts with extension
gRaphael is a Raphael extension to help you easily create graphs and charts.

Pro Pure SVG library
Pro Written by a SVG Guru and pioneer
Dmitry Baranovskiy also wrote Raphael (project now owned by Sencha), this is the updated modern version of that library. Dmitry also is a champion directly affecting the future of SVG standards with W3C

Pro Backed by Adobe
Adobe is backing the development of snap.svg
Pro Features
Supports the newest SVG features like masking, clipping, patterns, full gradients, groups, and more
Cons
Con Complicated, confusing documentation
The documentation is often not clear and lacks practical examples.
Con Can be difficult to get support
Online communities for Raphael are small and inactive compared to other drawing libraries, and many issues opened on github are never addressed.
Con Not actively developed
During 2016 was few updates, more updates in 2017
Con Spotty exporting
Exporting doesn't work well (if at all sometimes) with SVGs exported from anything other than Adobe products.
Con Weak documentation
Explanations provided in the documentation can often be unclear, with some features missing from the documentation all together.
