Laptop Workstation (For VR development ) in between $3000 ?

I already have a desktop. But as i move from country to country , so i badly in need of a laptop as workstation.
My budget is $3000.

So far my choices are these:

Choice1:

MSI 17.3" FHD 120Hz 5ms GT73VR Titan Pro-201 Intel Core i7 6820HK (2.70 GHz) NVIDIA GeForce GTX 1080 64 GB Memory 1 TB SSD (PCIE Gen3x4)1 TB HDD Windows 10 Home 64-Bit Gaming Laptop VR Ready

Choice2:
ASUS ROG G752VS-XB78K OC Edition 17-inch Full-HD Intel Core i7 GTX 1070 Gaming Laptop with Windows 10, Copper Titanium

Choice3:
Alienware 17
Intel® Core™ i7-6820HK (Quad-Core, 8MB Cache, Dynamically Overclocked up to 4.1GHz)
NVIDIA® GeForce® GTX 1070 with 8GB GDDR5

I am a bit confused about MSi. I kept them in choice1. but there thrmal system does not looks as good as asus or alienware

I need to buy one by monday. SO any suggestion about these 3 model or any other model will be very helpful.

I usually stick with ASUS. MSI makes some decent parts but ASUS has been around for a while and their durability and reliability is good. Alienware went down hill when Dell bought them out, they may be better than when they were first bought by Dell but they still seem to share memory a little too much for my liking. My only complaint about ASUS is that it will get very hot, or at least my ROG does. It has never overheated but has only been under constant load for a few hours at a time. Remember laptops really are not well suited for long heavy loads, if you are looking to do a lot of gaming and long periods of it, I would recommend that you get a desktop. If you really need the mobility then I think the ASUS will do just fine.