I chose Marshall even though Mesa is bloody powderful in watever it does.
But somehow, it's de crunch in Marshall that i truly adore and was what made me play up till de wee hours. (coz they have affordable 15W available as well. Hah)
Mesa rectifiers are a little to loose for metal chugging imo. And the distortion is kinda buzzy sounding. But Mark IV's are in a way different ballpark.
Peavey 5150 for me. Love that tight bass and smooth distortion. And... i own one