The poll question is a bit tricky, I like the sound of my Dr. Jekill & Mr. Hyde exhaust pipes in "Mr. Hyde" mode; however, I also like the sound quality of the Marshall sounds system. The sound & navigation system and the ability to stream music was the primary reason for selling the GS Adventure, and on jumping on the R 18 B-wagon; with that said, the new exhaust doesn't washout the sound of the Marshall system. (At least I haven't noticed a trade-off)
The J-&-H definitely trumps the sewing machine OEM exhaust system, it does allow the exhaust sound to be changed for those of us sneaking out of the neighborhood at O'Dark30; however it's a little expensive compared to the Vance & Hines system. Plus I have that little added stress in the back of my head, imagining the J-&-H SmartBox, and or one of the servo motors failing due to being an active device; vs the Vance & Hines, which is just the OEM replacement of the passive exhaust system.
If I had to do the exhaust system again; I'd probably go with the Vance & Hines based on price, providing I had to opportunity to see and hear it prior to making the choice. Don't misinterpret the J-&-H stuff, it's super high quality and I love the look; it's just pretty expensive when compared side-by-side.
In short, I'll vote exhaust "Loud Pipes" as it is the one thing missing from the R 18 off the show room floor.