Hello again ,
Thanks all for your replies , after evaluating both laptops for 6 days , and reading every single review on the internet , i 've come to the conclusion :
about the Alienware :
1- 4K screen is a huge failure right now , it does not support most of the applications , most of games too , even if it supported in some games it will not allow to play smoothly , games will drop sometimes to 20 FPS because the GTX980 can't handle it properly , maybe if you are working on editing videos or similar things you could go with it .
2- 16 GB max rams !!! ,, what a ridiculous decision , they don't offer even 32 GB of ram on their website , although the slots support 32 GB of ram , if you even want to ask which model of ram the laptop support their customer service will answer with (Hey don't add another 16 GB of ram or else you lose the warranty on the ram side , and you may fry your Motherboard ) !!! .. amazing answer .
3-Faulty Wireless card (Killer) which 90% of the people who own Alienware 17 R3 admit that .
4- heating problems !! ,, even the keyboard gets warm !! .
5- benchmark testsVS the old ASUS 751JY was for Asus in every aspect ! . this was the old one , how about the new ?
I think it's time to try Asus again .
Thanks .😄