Here is an excellent presentation on R vs SPSS vs SAS. Its favorablein analysis towards R, but still a very informative piece.
The original link is from –http://www.matthewckeller.com/Lecture1.ppt
Here are a few snapshots for comparing multiple packages-
Other Comparisons with Base SAS (a SAS Institute Copyrighted Product ) can be found at http://www.ats.ucla.edu/stat/technicalreports/
or by searching packages at http://finzi.psych.upenn.edu/search.html