After using a 16" laptop it would be hard for me to go back
I'm in the 14-15 camp w/ lighter form factors being worth the premium.
I tried below 13 after the trend of smaller laptops from a couple years back - I now don't believe anyone who tells me they're regularly productive on these smaller form factors lol.
It's much, much easier to transport even though I do miss the screen real estate.
Love both.