Which one better for hi-graphic game?

Well, you're going to have to link to specific models because there are varying configurations for each.

No clue until you link me to a page with prices.

G751JT-DH72 is $1,816
i7 4710hq processor
16GB Memory 1TB HDD 256GB SSD
NVIDIA GeForce GTX 970M 3GB
DL DVD±RW/CD-RW

G750JZ-DS71 is $2,248
i7 4700hq processor
24GB Memory 1TB HDD 256GB SSD
NVIDIA GeForce GTX 880M
Blu-ray-enabled DVD+-RW/CD-RW

The processors are nearly identical in power and consumption. I could not justify the cost difference based on that alone. You essentially need to justify the extra $430.00 for having blue ray capability, 8 gigs more ram and not having as good of a GPU. The 970 is a more power GPU and consumes less power.

Personally, the cheaper laptop is going to be better all around. Its cost savings is too much to ignore. The "better processor" isnt going to make a difference in real world applications. The 8 gigs of ram wont really be applicable to what you're using it for. Both have 256SSD's which is good.

I hope that makes your choice easier!

edit: I just realized my mistake that the cheaper laptop does have the more powerful processor. So thats actually a plus. Its a negligible difference, but if you get the newer, faster, less power consuming processor for less money, then thats great!

Agree with the above.

Did you really expect an answer like that without first showing us which two EXACT laptop models you had in mind?