But since we have fallen far away from the original post, would you buy a 2015 rMBP 15" or a 2016 rMBP 15" ?
I would get a 2016 one. I already experience only 45 minutes of battery life when running Final Cut Pro X, so I am not concerned with the battery.
There are more pros than cons with the 2016. Yeah the battery life issue sucks for most people, but I believe it will be fixed as it seems to be a software issue. Rev. A issues which are common.
If I am spending $3,499 on the laptop, I want it to last at least 4 years. Hopefully I can push it for 5 or 6 years. At that point, I am pretty sure USB-C will be VERY common. So future proofing is nice. And I have had to live with dongles and adapters for years. I have a 2013 rMBP. I have needed ethernet (adapter needed), DVI (adapter needed), VGA (adapter needed), three USB ports (adapter needed) and so on.
The display is much better
The SSD is much better at a 3 GB/s transfer speed
Thunderbolt 3 is better, no dedicated port
No dedicated ports (never used SD card reader port)
MagSafe was OKAY, but being able to charge with ANY port is a point in the pros column
The touch bar is nice for my work flow. I rarely used the function keys, so I might get some use out of the touch bar instead.
Touch ID is nice.