BTW: at the start of this thread, Donald directed me to an article on the Durst USA website. While the article is heavily slanted toward condensor enlargers, it none the less made for interesting reading. The article was well hidden in the website; here is a link that I hope will work:

This is one of those areas that can turn into a can of ..... something. My take on this, having used both condenser and diffusion is closer to what Les said above. It is the printer, not the enlarger.
Very true. But what I have learned from this thread is the tremendous difference between condensor enlarger design/quality. I wasn't aware that there was such a difference; I think my Omega B-22 may have to go!