For general stuff, they are both about the same. Oil changes are easy, you can get a wrench that slides over the oil filter, so on the 1500 you dont have to remove the bottom cowel, even though the book says to. Getting to the battery is easy too. Pop off a side cover and there it is. Air filter on the 1500 is a major PITA, but doable, just takes time. The problem is that older plastic gets very brittle, and you have to be very careful when you take it off and put it back on. I broke a nipple on a side cover and had to have it plastic welded. Still, they are both coverd in plastic, so it takes some time and patience to work on a Wing. Totally different mindset than say working on my KLR or a Sportster for example. The good news is that they don't need " major " work very often. Another good thing is that if you need to know how to do something, someone somewhere has done it already and there is a wealth of information out there.
1997 Honda Valkyrie, 1998 Kawasaki KLR 650