Laptop Selection-Round 2

Hey everyone, I asked a few months ago about a new computer and got good advice, but I decided to wait awhile. Well the time has finally come to buy. There are more options now, and I have it narrowed to 3. Acer S7 Samsung Ativ Book 9 Plus Razer Blade I am a Mechanical Engineering student who needs to be able to run programs such as Solidworks, Rhino, and MATLAB. All of these laptops have the i7 with 8gb RAM. Any help would be greatly appreciated. Thanks, Kirby