I've had two Road Kings and one V-Rod. There just isn't much of a comparison. I enjoyed the V-Rod, but did end up trading it on a Jeep Wrangler. There isn't much comparison between the V-Rod and the Jeep either. It just really depends on what you're looking for and what kind of riding you want to do. The V-Rod is just sneaky fast from about 60 MPH to 100 MPH. The V-Rod just isn't like any other Harley that I've had. It doesn't feel the same, ride the same, or sound the same. It's a great bike, but just different. I like the appearance of the new V-Rod Muscle, but didn't like what was reported in the first review I saw on the bike.
The Road King is very versatile. I really like being able to go with the windshield or without. With the back rests or without. It's great for riding around town, but with a luggage rack and bag (or a tour pack) you can take it out for an extended trip. You just can't appreciate how nice it is to have saddle bags until you've been without them. I think that if you want saddle bags, you need to buy a bike built with bags rather than trying to add bags to a bike that doesn't come with them as standard equipment.