The Marshall Sound Vs The Hiwatt Sound

I'm comparing two classic british guitar sounds: The Marshall sound and the Hiwatt sound. I'm comparing a 1973 Marshall JMP half stack with Pulsonic Celestion Greenbacks to a 1976 Hiwatt DR103 with Pulsonic Fane Crescendos. I'm using a 1969 Gibson SG Special, a 1973 Fender Stratocaster and a 2008 Gibson Les Paul R9.