i prefer tar, bzip2 and gzip myself, but that is because they are open source and create smaller archives, while retaining file permissions. By this logic, i prefer FreeDOS pkzip to anything from RARsoft, since PKzip is closed source. HOWEVER if you use linux, you can get rar and unrar for free from RARsoft, while you still need to pay for the windows version after 40 days (but now i think about it the DOS version might be free too)