This article will dispel your doubts concerning the difference between EF3 and EF4 framework.
Take a look on the comparison of the most important features of both frameworks.
| Features |  |  |
|---|---|---|
| Basic Settings | ||
| Upload logo image | Yes | Yes |
| Add site description | Yes | Yes |
| Enable/disable font size switcher | Yes | Yes |
| Enable/disable "back to top" button | Yes | Yes |
| Upload favicon | Yes | Yes |
| Layout Settings | ||
| Set template width | Yes | Yes |
| Set gutter size | Yes | Yes |
| Enable/disable responsive layout | Yes | Yes |
| Set main columns width | Yes | Yes |
| Ordering of main columns (left, content, right) | 3 variations | 6 variations |
| Select pages to disable component view | Yes | Yes |
| Offcanvas panel | No | Yes |
| Layout Builder | ||
| Customize desktop, tablet, mobile layouts | No | Yes |
| Create different layouts | No | Yes |
| Assign layouts to menu items | No | Yes |
| Font Settings | ||
| Set font size | Yes | Yes |
| Choose font family from predefined list | Yes | Yes |
| Use Google Fonts | Yes | Yes |
| Upload and use any web font | No | Yes |
| Color Settings | ||
| Template color versions | Predefined | Unlimited |
| Set your own template color version | No | Yes |
| Set your own colors for selected template areas | No | Yes |
| Set your own font color | Global font only | Global font, headings, selected template areas |
| Theme Customizer | ||
| Front-end tool to preview color and font settings | No | Yes |
| Front-end tool to save color and font settings | No | Yes |
| Advanced Settings | ||
| Enable/disable developer mode | Yes | Yes |
| Add code to the head section | Google Analytics and Google Webmaster only | Yes |
| Enable/disable CSS compressor | Yes | Yes |
| Enable/disable JS compressor | No | Yes |
| Enable/disable Facebook OpenGraph | No | Yes |
| Settings Storage | ||
| Store Settings | Yes | Yes |
| Download Settings | Yes | Yes |
| Upload Settings | Yes | Yes |
| Framework Updates | ||
| Update installation | Manual | Joomla Update |
| Documentation | EF3 Documentation | EF4 Documentation |