When comparing Webapp generator vs Initializr, the Slant community recommends Initializr for most people. In the question“What are the best boilerplates for modern webapp front-end development?” Initializr is ranked 2nd while Webapp generator is ranked 3rd. The most important reason people chose Initializr is:
Initializr allows you to "fine-tune" your template by allowing you to take the good stuff from both HTML5BP and Twitter Bootstrap and download a mashed up basic template, which you can begin development on.
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Pros
Pro Auto resolve dependencies
Any dependencies in the webapp generated can be automatically resolved, thanks to Web-app-generator's powerful integration with Bower.
Pro Image optimizations
Automatic automatic image optimization is a pre-built functionality of the web app generator. So that any sites that are made using this tool are perfectly optimized for performance.
Pro Automatic compilation & linting
As the title suggests, the yeoman watch will auto-compile your JavaScript and Sass scripts for you. Also your code will be run through JsHint (for liniting) to make sure best practices are followed as well.
Pro Built in preview server & live reload
The yeoman watch will compile your source files for you and refresh your page in the browser, as soon as it detects some changes that you've made.
Pro Integrates Twitter Bootstrap and HTML5 Boilerplate
Initializr allows you to "fine-tune" your template by allowing you to take the good stuff from both HTML5BP and Twitter Bootstrap and download a mashed up basic template, which you can begin development on.
Pro Well documented
Initializr is very well documented, even though it itself being a pretty easy to understand and use tool. The documentations are available in different languages as well, available via the International Guides section on the website.
Pro Speed: Setup time is significantly reduced
With initializr, very little setup is needed. All you need to do to be ready for development is provide your favorite template maker (HTML5BP or Bootstrap).
Pro HTML5 templates generator
It's not really a template by itself but allows you to create a custom template from known good technologies.
Cons
Con Default support is for libsass
Webapp generator currently has default support for libsass, which falls behind Sass in features (therefor has some incompatibilities with Sass).
Con Requires Yeoman
Con Is going to be retired at the end of 2017
It's been anounced on their homepage that Initializr will be retired at the end of 2017.
Con No ZURB Foundation support
Some developers much prefer Foundation over Bootstrap due to the flexible grid and large selection of widgets. However, Initializr supports only Bootstrap.