[ixtraz]

The main differences - all layout now responsive so no need to include bootstrap-responsive.css and use row-fluid, container-fluid. All stuff already always fluid now.

Second main point - the framework now mobile ready - that mean a lot of mobile optimisations and widgets for mobile devices.

[brokenparser]

Foundation was made to support as many screen sizes as possible with minimal fuzz and they're using Sass with Compass. They released version 4 about 5 weeks ago and it is mobile-first. See http://foundation.zurb.com/ .

[ixtraz]

OK.