What are the main differences between these two brands? Now does each rate as far as having better headroom, smoothness, gain and longevity? Want to replace my Egnater Tweaker 15 watt head preamp tubes, and I am "dazed and confused" over everything I have read. Play mostly classic rock but like the tone from players like Beck and EJ, too. Only play at home these days and not at very loud volumes. Opinions and suggestions wanted. Cheers.