Comparing Two Pairs of Mono's

I saw Klaus in operation a few years back at CAF. Didn't care for the style, YMMV.  Prefer the mom 'n' pop vibe of AVA.  Bought the M225's, and they're excellent.

Buddy just sold off Pass Monos for the AVAs 225 sound.

They are both just bridged stereo amps, I wouldn’t do either.
Only thing improved is wattage when you bridge a stereo amp, everything else take a hit, especially stability into low impedance speakers.

Go with true monoblocks of something else.
EG: used Parasound Halo JC1 monoblocks and they have high or low Class-A bias for serious or non serious listening.
https://www.ebay.com/itm/274899124769?hash=item400143c221:g:YukAAOSwSJNhEiIC

Cheers George