When comparing ExtJS vs Marko, the Slant community recommends Marko for most people. In the question“What are the best client-side JavaScript MV* frameworks?” Marko is ranked 17th while ExtJS is ranked 18th. The most important reason people chose Marko is:
Marko consistently outperforms other alternatives in code benchmarks, both on rendering speed and compilation time.
Ranked in these QuestionsQuestion Ranking
Pros
Pro Provides built in support for UI widgets
Huge amount of widgets available, also easy to build custom widgets by extending the available components.

Pro Professional support available
If you buy a license you can get professional support and premium forums. Support has short contact times and solutions are of great value.
Pro Well documented
ExtJS' documentation is very detailed and helpful. All concepts and parts of the framework are thoroughly explained.
Pro IDE plugins available
Plugins are available for JetBrains, Eclipse and Visual Studio.
Pro Easy reusability of code
By using the packages and custom components, code can be reused very simply.
Pro Flat learning curve
Anyone with basic JavaScript knowledge can start using this framework.
Pro Forum support
Forum support is available.
Pro Excellent design tools
Eg: Sencha Architect.
Pro Developer friendly integrated tools
Sencha Cmd, Sencha Inspector and some IDE plugins etc., are the tools which helps developers to speed up their development.
Pro Extremely fast
Marko consistently outperforms other alternatives in code benchmarks, both on rendering speed and compilation time.
Pro Custom tags
Custom tags provide a simple mechanism for embedding more complex components into a template by extending the HTML grammar with support for new tags. For example:
<div>
<say-hello name="World"/>
</div>
Custom tags are easy to create since they just map to a JavaScript "renderer" function as shown below:
module.exports = function sayHelloRenderer(input, out) {
out.write('Hello ' + input.name + '!');
}
Custom tags support nested content:
<fancy-overlay title="My Title">
This will be the body content of the overlay
</fancy-overlay>
Custom tags can also have parent/child relationships to support more complex use cases such a "tabs" component with nested "tab" components:
<fancy-tabs>
<fancy-tabs:tab label="Home">
Content for Home
</fancy-tabs:tab>
<fancy-tabs:tab label="Profile">
Content for Profile
</fancy-tabs:tab>
<fancy-tabs:tab label="Messages">
Content for Messages
</fancy-tabs:tab>
</fancy-tabs>
Pro Streaming
Streaming allows progressive HTML rendering and reduces time to first byte.
Pro Server-side rendering
Marko supports both server-side and client-side rendering.
Pro Marko Widgets
Marko Widgets allows UI components (rendering + behavior) to be built using Marko.
Pro Compiled templates are readable CommonJS modules
Avoids ugly globals and "named" templates.
var template = require('./template.marko');
var html = template.renderSync({name: 'Frank'});
Pro Asynchronous rendering
Marko makes additional asynchronous calls after the view rendering has begun.
Pro Lightweight runtime (~4 KB gzip)
Pro Easy to integrate with express.js
Easy Integration with Express and Node
Pro Documentation is well maintained and helpful
The documentation is extensive and very helpful. It also contains several sample applications which are very useful.
Pro Allows JavaScript expressions
JavaScript expressions can be executed inside the templates.
Pro Simple and readable syntax
Marko has a HTML-like syntax which should be easy to read and understand for everyone who has even minimal experience in web development.
Pro Short learning curve
It is easy to get up to speed and understand what is going on in a very short period of time.
Pro Small compiled templates
Marko's compiled templates are usually very small, as proven by benchmarks.
Pro Lots of tests
To prevent regressions, Marko includes a full suite of tests. The testing harness renders a collection of templates and does an exact string comparison to make sure that the tests rendered exactly as expected. There are also API tests, and negative tests to make sure that errors are reported in a friendly way.
To run tests:
git clone https://github.com/marko-js/marko
cd marko
npm install
npm test
Pro Friendly compile-time error messages
Error messages come in an easy to read and friendly format, with valid stack traces and file formats of the file(s) which brought the error(s).

Pro Concise and Mixed syntax
The Concise syntax type lets you write Marko with a Jade-like indentation based syntax, and the Mixed mode lets you combine in regular HTML-style syntax.
Pro Server and client logic can easily be expressed within the same template
Pro Has a very active and interactive community
Marko's development community is rather small compared to other frameworks but community is well mannered and active. You can chat with the core development team using gitter.im
Cons
Con Completely unreliable with regard to licensing and pricing
That ExtJs is expensive is not the problem, but what they did is started completely free, then switched the licensing model when they had profited from the community. Also, they suddenly switched from a single user license to a minimum of 5 users.
Con License
Ext-JS is not for free, it comes with a license.
Con Large footprint
The library is almost 500Kb in size hence significantly affects your page load time.
Con Expensive licensing
ExtJS is free for use in open source projects, but you have to use the unstable version which is riddled with bugs. Furthermore, to build a project (even if it's open source), you have to buy their proprietary tools.
For commercial projects, it costs $665 for a license.
Con No real support
You only get a limited premium questions that could be answered via the support and if the issue is too large then you might lose all your credits (it has a credit system for support) in one question.
In addition the replies in premium forum are sometimes less thought of than you would get in stackoverflow.
Con Lots of bugs
The community is very small and this is because the licencing is very expensive. Therefore not many people to test the framework and give feedback in order to fix.
They try to do everything in house which means that a small company (linkedin shows about 100 employees) tries to imitate something very large.
The scaling problems lead to lots of bugs and instability.
Con No web-workers
ExtJS does not take into account the asynchronous nature of todays web browsers where you can do heavy stuff on the background.
Con Tooling is poor
They had a GUI architect tool, but that tool never was up to date with the current framework version. Now they even seem to have abandoned the whole architect app. Also, to build a ExtJs app you have to use their tool (and then you have to pay, from that moment ExtJs is no longer GPL). But this tool also has lots of bugs.
Con Steep learning curve
ExtJs is a very opinionated framework. You have to do it the ExtJs way or it's the highway. So, a lot of time, things in your own opinion doesn't make sense or don't work in the way you expect it.
Con Quantity yes, quality no
There is a large amount of source code that can be useful and indeed all the samples works flawlessly.
When you try to get into more complex scenarios you will find yourself in situations where things just do not work as expected. You will have to do manual work.
Con If you want to get the full experience you have to use NodeJS
To use markojs's most popular feature: SSR although you can use any language based server as a backend. It is rather complicated.
Con Very opinionated and not customizable enough
Some custom use cases are not possible. For example, trying to build an AMP page using Marko can be very challenging (special style tag requirements are hard to work with, also, Marko by default inserts a script tag into the rendered output html which is invalid in AMP and needs to be manually removed, etc..)
