The G75VX will probably get you about 20fps on BF3, 40fps on Black Ops 2, and 60fps on MW3 (all in Ultra) while the G750JH and its GTX 780M would get you closer to 60fps in BF3, 80fps in BO2, and 120fps in MW3 - although the G750JH will probably cost nearly twice as much...
The G75VX will probably get you about 20fps on BF3, 40fps on Black Ops 2, and 60fps on MW3 (all in Ultra) while the G750JH and its GTX 780M would get you closer to 60fps in BF3, 80fps in BO2, and 120fps in MW3 - although the G750JH will probably cost nearly twice as much...