[Matthias247]

I have the 2015 and the 2017 (without touch bar).

I agree to most things, with the minor correction that the trackpad on the 2015 is also not mechanical (and works fine, I also like the size better).

Regarding the screen I observed: The 2017 has better colors. However it is far more of a dust and dirt magnet, and harder to clean. It seems like the coating or glass might be different, which allows more dust and grease to stick. As a result the display of my 2015 looks mostly clean, the 2017 is messed up as soon as I use it for two hours and have it in my backpack.

All in all I like the 2015 more. They should have just replaced the DisplayPort/TB2 connector with USB-C/TB3 and it would have been fine. The extra lightness of the 2017 is nice to have, but from a practical standpoint the form factor of the 2015 was already great.