Well if your comparing the two.
People say three cores these days are good enough, but both are four core though one is i5 and one is i7.
One is a 660M with the other is 650M, of course the 660M is stronger
One has 750gb with 7200rpm while the other 1tb 5400rpm, but the 750gb give a free free recovery disk. Wouldn't expect that from much computer selling sites.
One is 15.6" and the other is 17.3" both 1080p, but if you have a tv/monitor that's bigger wouldn't matter at all.
I would go for the MSI GE60. If your looking for which would last longer, if your a casual gamer both would do. If your not a casual gamer and play at anytime your free, they wear out in like 2 years, but the 7200 rpm on the 750gb would keep the computer going longer than the 5400 over the years with all the increasing sizes of files.