Kawasaki Vulcan 900 or Harley Roadking for intermdediate rider?

I'm 5'7, 29 yrs and only 150 lbs. 250 cruisers are piece of cake for me on streets and big roads. I'm confident i can handle big cruisers. Planning a 300 mile interstate ride on rented motorcycle. Can you suggest which among these two will be good for me. Here is some of my research:

Vulcan 900: Easy handling and great looks. Good low range but weak mid range. Not good on interstates above 75, over revs and uncomfortable on long interstate drives.

HD Roadking: No doubt on performance. But I may not be able to lean/turn it easily on interstates.