Don't waste time evaluating which Web UI libraries to use. Most of the commonly used libraries are very similar in functionality.
The recommend library is
It's the most popular available framework today, which means more people involved in the project, more tutorials and articles from the community, more real-world examples/websites, more third-party extensions, and better integration with other web development products
- Figure: Bad example - Zurb Foundation is the second most popular, but it uses Sass files and has the worst name
In VS 2013 Zurb Foundation was always out of date on Nuget. So if you use it (which is not recommended) download it direct from Github.
In VS 2015 these packages were moved from Nuget to Bower.
- Figure: Good example - leader among frameworks today, Bootstrap toolkit is recommended to build successful websites
The 3 things a developer need to know to get up and running quickly with ASP.NET MVC
Twitter Bootstrap & ASP.NET MVC - Intro / Quickstart
Other useful frameworks
Now that you saved a lot of UI development time by using Bootstrap, you can play around with other useful frameworks.
- KendoUI for enhanced HTML and jQuery controls
KnockoutJS for view-model data binding
SignalR for real-time web functionality