Will you trade one for the other, or have two?
As an IS (interstate) guy, I love the 7 gal tank (can be added to yours), the fairing (you have one, and I have no comparison experience on function, but you don't have two headlights), radio and 4 speakers, gas gauge (but trip meter is just as good), our start buttons don't fry with the IS relays, and we have an electronic speedo (not mechanical). (I don't have or want a CB, or use an intercom, but you might.)
The IS is somewhat harder to lift off the kickstand.
I like my supervalk way more than my trunk bike, and can actually carry more, more easily, on my supervalk (but not locked, but that doesn't bother me because all my needs-to-be-locked stuff fits in the bags).
I've never taken my fairing off (never had to). What I have to take off is the bags and seat (so does everyone with bags and a seat).
Don't take passengers, but if you do, the IS might be better for that. Though some of the larger passengers complain the IS backseat is confining compared to other Valks. Passengers who like to sleep in back are probably a little safer on an IS.
I've been a black and chrome guy forever, but must say the blue and silver IS is a real beauty (though I don't know if I'd get one just for that).
I see you are in FL. I bet heat is (at least a bit) lower on non-interstates, at least around town and cruising.
The mysterious IS air scoops should have nothing to do with it.
