@Sandstorm the question of portability should only be applied to people who travel frequently. If you are buying this PC for gaming and you don't find yourself travelling often, definitely go with the desktop with no hesitation.
Gaming laptops generally last a year before getting much slower, this is probably because of how bad the airflow is in the laptops. Laptop components are also weaker when compared to those of desktops. I've bought a gaming laptop, a GE70 0ND-033US, biggest regret ever, it couldn't even play BF4 smoothly on medium when I first got it (it was $1000), and struggled to play BF4 smoothly on low after a year of continuous use. Just the other month, the HDD failed. Anyway, I recently built my own desktop after doing like 3 week of non stop research, it came up $1100 including monitor and I can run BF4 on Ultra 1080p 16x AF at 90 FPS. Incredible difference, pretty much the same price.