Any suggestions?

2.5GHz : 500GB
2.5GHz dual-core Intel Core i5
4GB memory
500GB hard drive1
AMD Radeon HD 6630M
OS X Lion
VS
2.0GHz : Dual 500GB
2.0GHz quad-core Intel Core i7
4GB memory
Dual 500GB 7200-rpm hard drives1
Intel HD Graphics 3000
OS X Lion Server
OS X Lion

Which is better for graphics and video?
Thanks