But, typically I find that Rock/Metal guys like myself are looking for a huge soundstage, and that "live" sound. Maybe not the best imaging. But damn, it's like being at a concert.Huge soundstage is a sign of a good speaker with good resolution.
The idea that a speaker can be 'best' for a certain genre of music is one of the older and more established myths in audio. I had one guy ask me what the best speaker was for downtempo 80s music. Sheesh! How in the heck do you make a speaker favor a certain taste in music?? You can't- the speaker might have certain bumps and dips in its response, but what if the dudes on stage play different notes? Even in metal that tends to happen :)