I only drove a 2019. But ordered a 2020 on specs alone. I know someone that has one, and actually traded their 2019 for the 2020. They wanted the extra 2 feet and the bigger engine. I know they pull a large pick up.
The Dutch Star and New Aire have the same rear end gearing, (4.78).
With the difference in weight it should build momentum rapidly.
Almost to the point of acceleration. I wish we had waited a year to buy.
Our Dutch Star at 37' weighs about the same as a 35 NA. One of the main reasons for our choice when looking at it and a Ventana was the HP difference. I can say it gets going quicker than the small engined Ventana, but it's hardly what I would call quick. Our old Baystar would leave either one in the dust. Our present DS at 37K will climb most hills out west at 50mph towing the Wrangler which is about as much as I could expect.
I test drove one in Tucson back in January. The power is very nice, the glass dash takes some getting used to. It did not ride that much better compared to my Ventana 3407. The comfort drive still has the flat spot at center, so always correcting the straightness of the coach. If I win the lottery, maybe I would trade up for the engine and some of the creature comforts would be nice. Not sure I want all that "tech" since it costs money to fix once warranty is out. We had dishwasher in last coach, so I would never have another, would rather have the storage. Kitchen seems to be larger, and sink is defiantly larger than 3407. When have the money will decide if I want to spend it or not, not loosing sleep over it though.
Oh, you lose some fresh water capacity and some fuel capacity going to NA. Don't remember the numbers. I am getting 9-10MPG in my 3407, and that is consistent over our 13K miles, with 3 trips across USA behind us. I am not pleased with how much DEF it uses, since that is more expensive than diesel. Everything is a compromise, some things better, some others not so much. We looked at all three floor plans, so my advise to you is, look at all three and put slides in on all three, to see which one you like better closed up. Don't remember king bed options on different models, we liked the better booth option, but you lose something else getting that, don't remember what. We currently have the table and chairs, and traveling we put the chairs on the bed strapped together, which is what NM suggests you do. We also did not get couch, opting for the recliners and little table, those chairs are heavy, and have to be turned around facing the wall to travel, that is if you want to move inside the coach when everything is closed up. We don't put that slide out, if we are overnighting since it's a pain to move the chairs for one evening. Our longest day was 450 miles, getting in right at dark. Putting in at night was not to bad.