What should I choose - GPU Mining or CPU Mining? I have a HP Pavilion G6-2313AX Laptop with 
Processor  : APU Quad Core A10 and
Graphics  : 512 MB AMD Radeon HD 7660G (Integrated) and 2 GB ATI Mobility Radeon 7670M HD Graphics (Dedicated)

I know both specifications are not enough for dedicated mining. But I'm interested in it and just want to try mining.

Please help.
It is likely that neither is profitable for you, because ASIC miners are alot more effective than any GPU mining, which in turn is alot faster than CPU mining. But don't take my word for it. This hardware comparison wiki is a good source to make an initial estimate. There is one entry listing the combination of an A10 and a HD7660G GPU, claiming to get 105 MHash/s just from the graphics card (and not listing any value for the CPU).

If that doesn't deter you---at 100 MHash/s you are looking at an expected average reward of less than a dollar per month, probably less than the electricity your computer needs is worth---please consider updating that wiki with the performance you are getting.