I have a 15 inch MBP, but work docked most of the time with a Thunderbolt display and a second external monitor run vertically. It works well. The newer models are very portable. You should not go wrong either way.

Just be aware that you can no longer upgrade the RAM and solid state drives fail spectacularly. So be sure to have automatic backup to Time Machine or other. I just recently recovered from my 8 month old MBP having catastrophic storage failure without warning.