I had the 14" initially, then I went to the 16" but didn't really like the screen, refresh rate seemed even slower than the 14". I returned/sold both couple of months ago and recently bought a 14" again.
I think 14" is a good compromise if you need something lighter to carry around and have the option of docking to a external monitor.
If you strictly rely on the larger screen state, and don't mind the added weight and size and are using the MacBook as a desktop replacement, the 16" is a solid choice. I just can't imagine bringing 16" everywhere in my backpack with me, it's quite a bit larger and heavier, with that said you do get used to it pretty quick the more you use it.
Also the 16" slower screen refresh rate was a deal breaker in my case.