Everyone has a different opinion. It is well known that AMD is a gamers processor and will out perform intel in games. I run a i5-2500 4 core Intel processor and am very satisfied with it. As MaDef indicates the intel 3rd generation is a little faster processor, less power consumption, which in my opinion would probably run a little cooler than the 2nd generation, which can be important for a laptop, as they generally run hotter due to their architecture.
As for brand name laptops, the three you indicated are the best. Acer and Asus have risen to the top in the last couple of years.
Check out the Acer Aspire TimelineX AS5830TG
i5 processor
15.6" screen
NVDIA GeForce GT540 Graphics
Here are the
Specs on Amazon
Just more to think about.