Both are great grids... but either have too much extra stuff or not enough in them. So I created my own mash-up of the two. Below are all the features I've tried to incorporate/accomplish:
A page to start a template from
Support as many browsers as possible (reasonably well with limitations)
Flexible percentages based grid
Nestable
Automatically resize images to stay within their columns/containers
Designate objects to be only displayed on mobile or non-mobile
Offset columns
Media query break at 500px width for single column
Can change media query break point with one change to CSS file (not spread all over in multiple css tags/references)