I've had both, and both were great. I don't consider the Eden to be "sterile" at all, considering that's quite a colored tone just naturally coming from the amp and is what some folks don't like about it.
However I've had the DB659 paired with a QSC PLX1602 and had it bridged into an Accugroove El Whappo, and lemme tell ya, that was some tooooaaaannneee right there! One of my favorite preamps, for sure.
SPECTOR® Club Member #319
Spector NS5 & Lakland 55-94 -> Circle K strings -> Mesa M6 -> Boogie PH212^2