I'd lean more towards the MBP also if I were you, I'm also in the Apple eco-system and own a 2016 MBP (2.9 i7, 460 Pro, 1TB).
As they've been out for a while now, check the refurb section of the Apple website and see if you can pick up a better spec model for the same price. A 512Gb drive will give you more flexibility in the long term if you want to do a Windows partition and/or VMs.
You can also pick up any TB3 eGPU enclosure down the road with MacOS supporting them natively now too. Currently awaiting GeForce 10xx series OS X drivers though current Radeon cards are supported.
I've never owned a Blade, although, did have a Blade Pro with the 1080 for over a month. I couldn't stand the constant whirr of the fans and during load or gaming it sounded like a jet and got seriously warm. I've used MacBook Pros since 2008 and never had an issue with one breaking down on me, if it did though I wouldn't worry too much about getting it fixed under warranty unlike a Razer product. MacBooks also hold their value ridiculously well...