On the other hand 7-ZIP is also portable, the library is LGPL, and has compression rates much better then other two, comes as a cost of being more CPU consuming. Of these three, ZIP is the most proliferated, most anything supports it, many applications have built-in support.
Ok, TAR's out, so that leaves you with ZIP, RAR and 7-ZIP. In the case of zip, rar or 7-zip, it'll go to the index table, skip to relevant position of the archive and only process relevant files. To get the last file from tar.gz or tar.bz2 archive, you have to decompress and process all of it. If you're expecting that you ever need to restore only limited number of selected files, forget about TAR. It's only good if you're planning to restore the whole thing. The problem with TAR is that it has no index table.
For archiving they are usually used with TAR. Compress, Gzip, Bzip, Bzip2 are not for archiving multiple files.
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