When comparing Snap.svg vs PERGOLA, the Slant community recommends Snap.svg for most people. In the question“What are the best JavaScript drawing libraries?” Snap.svg is ranked 7th while PERGOLA is ranked 25th.
Ranked in these QuestionsQuestion Ranking
Pros
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
Pro HTML
Pergola runs seamlessly in an HTML environment (option in configuration file). All the examples are provided both as SVG standalone and embedded in HTML, and are strictly equal.
Besides its universal Node Helper (http://www.svgmagazine.com/jul2011/dom-helper.html) Pergola also provides the equivalent for building HTML nodes and <foreignObject> HTML nodes.
Pro SVG native
The first and most accomplished SVG native library, 100% cross-platform compatible.
Cons
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.
Con Commercial license
PERGOLA does not offer a free version. The price for a single developer to use PERGOLA is 400 €.