Coming from a long, long....way too long line of bat wing faring bikes, I went with the Road Glide after a ride around Knoxville. I was impressed with the ride but when I hit the interstate, I noticed that while the wind was still there from the passing 80 plus MPH trucks, I didn't feel it in the handlebars fighting it like I always had on the bats. It moved the RG around but no fighting....sold me right then and there. I've had it for just about three years now and after many long trips (Sturgis, Wyoming, Canada), I'm tired at the end of a long riding day but not in the shoulders and arms like I would have been on any of the past batwing-faring bikes. I'm still very happy with going fixed faring.
A couple of things to consider, however. The radio is a LONG way away from me compared to the bat wing bikes. With the handlebar controls, I never use the touch screen so that helps.
I'm 5'6 so I did install the premium low HD shocks on the rear lowering it 3/4" which helped and I swapped sides on the passenger floorboards which allowed me to easily stand flat footed with the stock hammock seat. I believe the new '18 comes with the premium, non air shocks which are a bit lower so that may not be an issue.
If you ride two up and come from a bat, your rear passenger may notice a bit more side wind as mine did. I've just about eliminated it with a Clearview shield, side wind deflectors from Kury. and a new helmet for her. Since your King has a bat wing faring as shown in your avatar, the wind comparison should be similar as we've experienced. If you still had just the windshield, your BSR may notice less air on the RG....
Really, those items listed were more of a difference than irritant.
So, it's not a stupid question at all. Actually, it's a great question in you are actually thinking about it prior to the purchase then just operating by the seat of your pants.
By the way, I like the color choice you have on the '18. I've seen a couple in person and they look very nice. If it were me and I was in the market, that color combo and bike would be near the top of my go-to list...I'm still waiting to see the CVO Limited in the red fade color...that one seems to be elusive along with very nice in the pictures.
Good luck in your choosing....