Sean Casper 421a or Don Garber 421A amp?

Sean Casper 421A amp or Don Garber 421A amp/ Have only listened to Garber. Most musical amp I have heard so far. Have a pair of Wavelength Cardinals.
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A Sean Casper 421A amp just sold on USAA.  It seemed to go for a very fair price.  I thought about bidding on it myself but got distracted.

Are you lucky enough to think you'll find a Don Garber amp for sale these days?  Well do you, punk? (sorry, I couldn't help it)