Neither.
17”. There is nothing like looking at the 17” high-res anti-glare display. I’ve owned quite a few of each generation and whenever I don't have one, I get twitchy and buy a few like candy. Strip them, clean em, spruce them up with new bits & bobs, and set them free to run amok out in the world again. They’re the most awesome MBP, that Apple just never got quite right.
But my favorite pairing was years ago, when I’d use the 2015 Retina MBP plugged into a 30” Apple Cinema display, with the little pinnacle of the unibody macs, the 2012 13”, as a portable itunes library off to the side. Then when I either had other ppl over or wanted to keep working on my couch across the room & use the big ACD as a tv, I’d just take out the 15 and plug the 13 in its place, & viola, instant media center. It was pretty sweet with the ir remote. Both computers are the battleships of their line. After the last drive finally died I bought a pair of 8tb ssd‘s for that little 13” and put a 4tb WD Black ssd in the 15”. Pretty great.
16 just makes me mad that apple wont make a proper 17, and 14, what even is that…