[jamhan]

Ease of getting started is one reason.

Bootstrap:

  1. <link rel="stylesheet" href="<bootstrap-cdn>">
  2. Use it

Susy:

  1. Install Ruby
  2. Install Compass
  3. Install Sass
  4. Install Susy
  5. Use it.

[inanov]

In my case, Ruby is already installed, so it's quite easy as:

1. gem install compass 2. gem install sass 3. gem install susy