Trying to decide between two Asus laptops, and these two processors are the main difference. I see that the I3 has a faster processor speed and system bus. Why is that and does it make a difference? I will probably be watching DVD's and some gaming(first person shooters and action, no WOW or Star Trek or anything like that).
The Core i3 is a newer processor, so if you can get it for about the same price, I think you should for the i3. I've read that it gives better battery life as well. Also, because it's newer, it should be more "future-proof" and able to handle newer software better, later down the road.
Aside from all those minor things, there really isn't that big of a difference for your needs. Many applications don't even utilize the hyper-threading technology yet, so it's not all that important, imo.
Just get whichever one you want, though I'd suggest the i3 =P