RAR is a proprietary archive file format that supports data compression, error recovery, and file spanning.
ZIP is a format for compressed file archives, allowing packaging of multiple files and directories into a single file.
"One reason to use rar it is sooooo much better than zip"
from question "How to compress text file to rar format using java program"
|Decompression much more||
"I ve heard that rar decompression requires much more memory than zip decompression"
from question "Minimum memory for RAR decompression"
"By the way i would suggest creating rar self-extracting archives instead of zip self-extracting archives as with rar compression the exe file with the right switches for best compression using additionally also solid archive options could be much smaller than with zip compression"
from question "How can I automate the building of this Winrar Sfx File"