Pass Labs “House Sound” vs. McIntosh “House Sound”

I own a Pass Labs X 250 for LR Focal floorstanding speakers a X260.5 for my center channel and large Focal Rear speakers that I Run with my X5. I know that your are asking about A Pass Labs XP 20 however In my opinion McIntosh does not come close to the build quality and sound reproduction of almost anything Pass Labs makes. Pass Labs CS is the best they STAND behind what they sell 
My AV is a Krell 707

I've never heard a Pass Labs but I might comment on McIntosh.  McIntosh's 'house-sound' might best be described as exceptionally smooth with a wide soundstage yet not too forward.   McIntosh has excellent build quality, resale value and often understated fact that all of their component visually match in terms of color scheme.  Nothing like having a full rack of matching gear.  Personally I don't care about those features and I've found other gear that sounds better to my personal tastes.  McIntosh is like the Apple of audiophile gear, well built and respected but not doing anything extraordinary.   An excellent well-rounded setup could include a Pass Labs X25, Schiit Yaggi DAC, and your choice of tube preamp (my preference would be Prima Luna premium or Conrad Johnson classic depending on budget).

I´ve not heard the mcintosh but have had the xp20 for some years now and also the same c4s you own. My experience is that most of the time break in is crucial, more so for this preamp.
Out of the box the sound was closed in ,dull and lifeless. So much so, that I felt I had made a mistake in upgrading ? from the pass xp1 after having achieved the performance I was already satisfied with.
But being forewarned by the dealer I reluctantly exercised patience and after what I believe to be several hundred hours ( the dealer advised 500 !) the sound opened up beautifully and have been content ever since. In fact it may be the only piece of equipment that I´ve  never felt the urge to change. At least until now and it has been with me for more than 5 years. 
The xp20 is a fine piece of equipment, dead quiet, with few if any rivals within its price range.

IMO

@rost it’s preowned, so I don’t think I’ll need the 500 hours of break in!  But, I appreciate your comments and am super pumped to get it integrated.  The C2500 was the longest standing piece of my ever revolving/evolving gear setup.  Like a well loved family pet that has since passed, “You are gone, but not forgotten!”