We know which is stronger. Which do players like best?

Most people like the "Deep" versions of these programs which use multi-processors. It is generally thought that Deep Rybka is the strongest program out there--however for most people who use such engines the reh=gular version of either will do.

Both Fritz and Rybka can use the same interface which I find more important and useful.

Most people prefer deep fritz 11 from what I've heard.

I have fritz 11 and it plays so far above me,if i had the deep version would i be able to tell the difference?

I just use it for the training help mostly.

Both tell's me that I stink at chess, so I hate both :)

Rybka has won last two Computer chess championships..

If you run the differnet engines on the same GUI they effectively are the same except for playing strength and style--in terms of style I prefer Schredder to both Fritz and Rylka.

I prefer Rybka, because it beats Fritz, even in dubious openings.