1) The speedometer and odometer are more accurate on my Harley. At 75 mph, the speedo is off by 2 mph. On my Roadster at this speed, it's off by about 4 mph.
2) Highway pegs are our friends. I will often throw my legs on the boxer's heads, but the dedicated highway pegs I installed on the Dyna allows for easier foot positioning.
3) Pennsylvania and New Jersey roads gave me a renewed appreciation for how good the Roadster's suspension is. The HD isn't bad, but the conventional telescoping fork does not smooth out irregularities as well as the Telelever/Paralever suspenders.
4) Riding the Dyna naked without a windshield is gentler on the ear drums than the touring shield equipped Roadster. The flip side of this comparison is that I had to fight the wind more on the naked Dyna.
5) Throttle friction locks or cruise control should come standard with all motorcycles.
6) Thick winter gloves + thick handlebar grips make for uncomfortable fingers after a while.
7) Upright positioning is fine if you have a windshield. Without wind deflection, the upright position of the HD induces me lean forward a little bit to avoid feeling like I'm going to be pushed back by the wind.
My overall fatigue level is about the same for both bikes after the journey. The Dyna as I have it set up right now allows for more flexible body positioning, hands-off-the-handlebar cruising on the highway, and lower noise with no windshield. The Roadster's heated grips, wind deflection due to touring shield, and smooth suspension make for a more luxurious feel.
Tomorrow, I get tol battle New Jersey rush hour traffic.