Are EL34 based amps more musical than KT series based ? Or it's purely a matter of design?

Something from the guitar amp world. EL 34s have a different distortion signature to 6L6s - an evolved KT66. 34s clip more quickly but have a smoother distortion - think of a Marshall stack v a Fender Twin Reverb.

However, we use Marshalls because we want them to distort. Not something we look for in a hi fi amp.