which is a better match for best results

auxinput speaketh truth!

which is the best suited pre amp for rock and jazz

Electronics can in no way favor a certain form of music! Can't happen- no how no way.

@atmasphere - well, I beg to differ.  There will be some systems out there that are too bright or with too much silver.  They may be okay for things like jazz (piano trio or quartet), but with rock music, they just get to bright/harsh/thin.

If they are that way with rock, they'll be that way with everything else too as soon as it gets complex. The kind of music won't matter.
This is without any doubt the most common myth in audio- that equipment favors a certain kind of music. I had a guy ask me one time what the best amp for downtempo 80s was. I'm pretty sure he was serious, but if not he totally got me.

I get the opportunity to hear mix and match equipment in a variety of settings, I would suggest sticking with one brand of equipment, that way they are voiced the same. Attempting to tailor a sound to get the best results is difficult to do under the best circumstances.

I am sure cables make the difference in any system. Excluding the best metal conductor, silver, is kinda weird. Kinda sounds like a snake oil experience.