Of all the differences between these two the ones that I would focus on are the internal components. There are main differences that put these laptops in separate categories.
The main differences:
- Select Edition
- Core i5 and i7 CPUs
- Integrated Intel HD graphics
- Quad Edition
- Core i7 CPUs
- Discrete Level Graphics (AMD Radeon HD 6490M and 6770M)
Basically the Quad Edition will be a better gaming/intensive application system. The Select Edition is better suited for mostly casual things like web browsing and movie watching.