Dell laptops serve best with the warranty, so if you're planning on getting one, do extend to 3 years warranty.
Otherwise, go for other brands instead
As for your question, it all depends on what you want to use your laptop for... If gaming performance is your top priority, then the Asus would be the better pick because of the more powerful GT650m dedicated GPU.

If you're only gaming abit and prefers a laptop that can be used for some photo/video editing etc., then the Dell 15R SE with FHD would be the better pick~

Yup, extend to 3 years on-site warranty
Yes, GT650M is more powerful than the AMD HD7730M..
Yes again, the difference between FHD and HD resolution is significant and clear