Help deciding on 2nd hand MSI laptops (GS40 / GS60)

Managed to find 2 2nd hand deals on the MSI GS40 & GS60 and need help deciding between them.

Don't plan to stick around and wait for 8th gen processors since my laptop will be plugged in at home 95% of the time. The reason why I'm going the 2nd hand route is because money is tight (just got married) and I seldom game, though I would like the option when I finally get some time in. Titles like Shadow or Mordor / Doom.

Main use will be day to day productivity and bringing it out when I travel overseas for work. Battery life is important (gaming laptops aren't great for these I know), along with noise & heat.

GS40 ($800 USD)

i7-6700HQ

16GB RAM

1TB + 128GB SSD

GTX 970m

GS60 ($950)

i7-6700HQ

16GB RAM

2TB + 256GB SSD

GTX 970m

4k display

I'm kind of leaning towards the GS40 since I'm not a fan of numpads which make everything feel off center. However the GS60 has a bigger display but if I game I'll probably hook it up to my external display. Size wise I use a 14" HP EliteBook 840 as my daily driver at work and my current Asus laptop is a 14", so I'm not sure how the transition to 15.6" will be. TB3 would be nice but from what I read TB3 support on these models is really iffy / non-existent.

Ideal laptop would be the Gigabyte 14 but that's way more money than I want to spend on a laptop.