One thing I see right off the bat is the gaucho/couch. We have the 16BH and if it weren't the mods we made to the bunk the only place we would have to sit is the dinette. It's a little tight sliding in and out just to sit. And at 80″ you could use the gaucho for a nap :).
Actually since the beds are only 74″ long, how tall are you and will that make an impact?
And again, having the 16', as long as we can live outside, it's quite enough (ok, barely enough with the dogs taking up floor space). But if you are cooped up inside due to the weather, can you live in the 16' footprint, or would the 19' add enough to be more livable?
We had a couple of nights where it was really too cold to just sit outside without a campfire (maybe even with a campfire). Once inside, we were pretty well limited to going to bed, which didn't bother me so much because I brought my Kindle and could read. But our dogs pretty much take up the floor space so there isn't much moving around. And with our main bed being the dinette, it's usually in the down position so there isn't much room to just sit.
Fortunately, we haven't had really rainy weather where we couldn't at least sit out under the awning on any of our camping trips. Being cooped up in the 16' foot print might be a little much. We would definitely have to set up the dinette and even then, it's not the most comfortable just sitting. OK, I have circled back around to the gaucho again.