Jason H said:
For gamong on a graphics card whats better to have high GPU clock speed or hi memory clock speed
You can't compare GPUs on only core clock and memory. Most GPU models have different architectures so only a side by side benchmark will show you which card is better. That is why when comparing cards you should read reviews by popular sites: Guru3D, AnandTech, Techpowerup, etc.
It is very simple, just do a google search: '<name of card here> Review'