I have a Quinny Zapp (in black, boring but oh so classic!!) and I think the Iron looks soooooo much better than the Music Mosiac!!!
The MM is far too busy and in a way kind of looks cheap like made in China or something!! It's got too many of those primary colours!
Hope I helped!
P.s are you using your Quinny just as a stroller as I know that my likes to have a nap sometimes when out so we only use it for short trips to town!