Laptop Core Duo

Which one is better for a laptop: Intel dual core or core 2 duo?
I want to buy a laptop mainly for university usage, and I have been told that core 2 duo is the newer one and the better one, but it also makes the laptop a lot more expensive. Is there really such a big difference, and which one is better? Thanks!
Intel core 2 duo is better than intel dual core. Im not sure if you can buy just intel dual core laptops. Check out this link of the different laptop processors.
http://www.intel.com/products/laptop/processors/index.htm
Use the comparison tool.
Gateway 14 Core 2 Duo, 2GB RAM, 160GB HDD Tablet Laptop …