Krell 650 Mono Blks or Pass Labs X600.5?

Anyone out there have any experience with either of these amps. I'm leaning
towards a warmer more transparent sound stage. At present time these are
my current choices. any info will be appreciated.

Thanks, Fade45
I think the Krell has more liquidity , but when I listen to music that was recorded digitally at anything under 96k I use my Plabs, it helps undigitize the sound.