Elements of importance:

1. Testing ability, how easy is it to get to 100% code coverage
2. Bundling, managing dependencies and making
3. Debugging tools
4. Live code changes
5. Ease of integration with other scripts
6. Easy at chucking and optimizing time to first paint draw
7. Path forward for existing code
8. Migration cost (downsides)

Feature	React + Redux + Webpack	Angular 2 + SystemJS	Angular 1.X
Testing to 100%	Easiest I’ve seen, React itself is 87%	Not complete yet, Who knows (not a good sign)	Very hard
Documentation	Lots of good quality	Some more likely to come (A2 is still beta)	Lots of docs but many promote bad CS patterns
Dependences	Easy (many formats)	Easy (many formats)	Via magic variable names (not good)
Debugging	React devtools, Redux devtools, webpack errors push to the browser (cool), sourcemaps Overall best I’ve seen	Beta tools (ok)	Angular devtools (ok) debugging $digest is very hard
Live Code Changes	Hot module loading! With redux this is just amazing – reloading at the same state	No hot module loading yet	css only, does not save state
CSS Helpers	CSS Modules! so cool	normal	normal
Integration 3rd party	Pretty easy (for example bootstrap JS just works)	would need to do a test example	Can be very hard if it competes with $digest
Chucking	Webpack is the best	SystemJS is good but not great yet	manual
Other notes	ES6, logic easy to be in anything – geared towards functional programming	Typescript prefered – geared towards .NET developers	Change expectations when it came out
Path Forward	Co-host sites (I’ve done it before it’s not bad)	Co-mingle (this sounds like a debug nightmare)
Migration Costs for redesign	Basic site css+html will have to be done for both A1.x and React. All new features/pages done in React. All logic should move over pretty easily (I’ve done this before)	A1.x and 2 could potentially use the same site template (however bindings are not quite the same). All new features/pages done in A2.  All logic should move over ok	No migration cost. None-trial cost in speed and testability which leads to bugs and loss of trust.
Supported by	Facebook, Airbnb, Netflix, NFL	Some of Google and Microsoft. (Google also supports polymer)	Not as many as you would think (I’ve been using Chrome’s Library Detector for years and most big sites do not use Angular they still using backbone or just jQuery. Some are now using React.

 

Other frameworks:

Vuejs: nicely tested, more performant than A1 or 2), uses webpack, vue files are cool

Riotjs: small and simple, pretty fast, better for smaller sites

Aurelia.io: by Rob Eisenberg

Mithril: very fast, but very small usage. Sortof conceptually like React

Ember: best for people who don’t know what they are doing (as I’ve been told by a couple of teams that picked it)