Hi and welcome to the forum. Congrats on your upcoming purchase.
I'm partial to the Monaco but will let our experts with direct knowledge of both coaches help you out on that.
If you're looking for a place to stay in the wine country, consider: Napa Valley Expo
. I'm from NorCal and have found this to be the most to our liking in the area. There's also a place at the Calistoga fairgrounds. We haven't stayed there but did check it out. The surrounding area is quieter and prettier but the sites are basically in a gravel parking lot.
Best of luck with your decision.