I recently had to sell my desktop workstation and started looking for a portable solution. I asked myself the same question as many of you have, which is what laptop I should buy to be able to work with good performance. Long story short I bought a laptop with an Intel Core i7, 16 GB RAM and a Geforce 960M dedicated card and I noticed that the performance was more than I expected. You can see how it performs in the video below.
I am in no way trying to advertise this laptop. I just wanted to share this with the community and perhaps help ease some minds when it comes to purchasing a laptop for UE4 game development.