I have been watching laptop reviews for a while and between the two, I'd go with Dell.
The 7577 was one of my considerations between the Dell 7567 or Dell 7577 and ultimately went with the 7567 for battery and subwoofer.
I pick Dell for it's build quality and low price compared to other laptops. It's build quality is exceptional and it's easy to get into with only one screw a the bottom of the laptop. And while most laptops are called budget, the decent variants are priced well above $1000.
I had a Lenovo laptop (Y40-70)before and it was terrible experience. Most say it was because it was refurbished, but it was too bad to be just that.
I would also look into the Dell G series laptops. They have the similar specs as the 1060 at...