need some recommendation as switching from desktop to notebooks...

I'd narrow down to two choice cuz I prefer AMD (ATi)graphic for games...

- which have better LCD screen..?
- which have better sound quality..?
- which of this is more solid in terms casing build..?
- AMD HD6750/HD6630 capable to switch between i5-2410M like Nvidia Optimus tech..?

Inspiron 14R, i5-2410M + AMD HD6630@RM2349, Free 2nd year warranty
Pavilion Dv4, i5-2410M + AMD HD6750@RM2899

many thanks for reply