You might look at the G750JX, it's about the same price as the MSI, with the same HD, and memory. It also has the 770m vs the 765m in the MSI. I just got the G750JX a few months ago and love it. I looked at the MSI but because of the slimmer profile they got pretty hot. I keep the Asus on my lap for extended periods (5+ hours) and it never warms up, great cooling overall. Also good positioning on the cooling, straight out the back, with no ports there. It is heavier, so that is personal preference, but a bigger, cooler laptop will last longer.
Wifi support has been good on the Asus, but I have heard bad things about their tech support, not sure about MSI. I think the Asus gets the nod on reliability due to its size, but I haven't had mine long enough to say.
Either way both are good picks. You can try the Asus at BestBuy, it isn't the same model, but it will give you a feel of the laptop.