Going to have to completely disagree from experience, owning a 2017 13”, a 2015” 13” and a 2011, 13”, my daily driver is the 2015 due to the craptacular keyboard on the 2017. The heaviness of the 2015 vs. the 2011 makes all the difference but the crappy keyboard is not worth the two pounds and more importantly, ports, that the 2015 offers.
IMO there is also virtually no noticeable performance differnence between my 2015 and 2017. Both i7, 16GB RAM, 1532MB VRAM.