So newer is better plus a step up in CPU and possibly to DDR4 RAM.
ASUS ROG G551 -6 months gaming use-
DELL Inspiron 7559 -2 weeks use- or practically new as the seller advertise it.
ASUS im getting it $50dlls cheaper, but for that difference im not really thinking about money but more about best buy. Im using it for more medium than heavy level gaming and business.
Thank you !