If you beleive that THD and S/N ratio's are really important then you should thank the marketing departments at amplifier companies. Now 99.9% of amps have ratings in those two catagories that are to good to be audible.
Most people are hard pressed to hear a few percent distorition on a test tone and more distortion can be masked in music.
GsTeg has already brought up a resource that might help you better understand the issues at hand.
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