which is better? Stereo Amp or Monoblocks?

I prefer separate monoblocks but each has its sonic merits.  After building both push-pull and SE amps, some of which have been very similar in design and build except one being monoblocks and the other a single-chassis stereo amp, I reached a tentative conclusion--- the main differences I could hear were actually in imaging and soundstage characteristics.  The stereo amp seems to have greater image density in the middle of the soundstage and less extension to the extreme sides.  The monoblocks have a bigger soundstage with greater extension on each side but images are not as precisely fixed in space in the middle.  Overall I prefer the monoblock presentation but I can see how someone else might prefer the stereo.  I say "tentative" because it is really difficult to be sure what you are hearing is due to the monoblock vs. stereo chassis and not some other issue, but that's what I have heard on a couple occasions when I was able to make such a comparison.