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ISA428 vs. . VMP-4000e

well, I have heard really good things on both of these units and have never heard anyone compare them to each other. They are both 4 channel mic preamps, the 428 being solid state with the optional 8 channel ADAT out ($1699, $599 for optional ADAT a/d), and the VMP-4000e is tube with just analog outs ($1899). I know they have different "colors of sound", but is one better quality?