Which desktop replacement laptop should i get?

Im planning on getting a new laptop that's good for gaming and working on (design, photosop, programing maybe CAD programs,et). My current Options are the Toshiba Qosmio X505-830/832 (830 & 832 are the same laptop but with different warranty) and the Dell Studio17, the latest model that comes with the i7 and dedicated gpu. Both laptops have the i7 cpu and dedicated gpu, but im not sure which gpu or laptop is better for my interest