Unless you know a lot about bike's and maintenance, I would stick with the Honda as the rides were smooth and the breakdown ratio very small. You could also find Honda dealers just about everywhere in small towns compared to Harley or other makes of bikes. In other words, keep it simple and most readers will accept...
In 76, I had a 1200 HD Super-Glide and road it from DC to Daytona for bike week in a pack of about 30 other Harley Riders and a dozen vans. The breakdown ratio added a full day to our journey. We were constantly picking up other bikers along the way. Riding through some small towns in South Carolina and Georgia, the cops would escort us through town. At some gas stations, the owners would lock themselves in the office and would not wait on us. They also hated hippies in the south back then too, and we were sort of both. My time we reached Daytona, there was almost a thousand bikers in our pack...
In the late 70's I moved to Phoenix Az. We did the 1-40 route back then and it was no where near finished. I swore I would always wear a helmet. I lost too many friends doing stupid things on bikes without helmets. But once I got to Phoenix, the helmet lasted about a dozen stop lights. Your sitting on a bike that is putting out a lot of heat, on pavement that is reflecting heat and the air temperature is over 100 in the summer on a daily basis. The helmet just trapped all that heat, so off it came...
The wife and I though had a few incidents on that journey with locals, but the trip was amazing. We still have the pictures of wide open country to the horizon, our first Saguaro Cactus, Indian Ruins, Armadillos and all sorts of things. It's a far different environment than what I was use to in Virginia and after two years out there, I missed the color of green. When we returned home, crossing over the Mississippi into Tennessee, my eyes just sort of relaxed because everything was a vibrant green instead of the dull browns and dull greens I had grown used to out west.
Good luck on the journey in your story, and with your writing...