As Minh said, that's a personal choice. Some folks are more classic/traditional and typically prefer the perfect looking fish with characteristics of a wild fish, while others like to be different or unique and therefore will chose misbars or fish with other unique patterns (thus the popularity of "designer clowns").
For me, when it comes to captive-bred clowns, knowing that it's actually more difficult to breed perfect looking clowns, I've come to appreciate them more than misbars.