I've figured out that 2nd laptop will be more powerful because Total Graphic power is not determined by combining both integrated and dedicated graphics.
It is mainly dedicated graphics.
2 Laptops are under my consideration.
1st:- i7 6th Gen 6500u processor which has Intel® HD Graphics 520 processor graphics & ATI radeon r5 m355 graphic card.
2nd:- i7 5th Gen 5500u processor which has Intel® HD Graphics 5500. & Nvidia 940M Graphics Card.
Now i know that Intel 520 graphics...