What is the "best" lossless compression format for compression+archive formats?

I know there are many different compression+archive formats (zip, rar, 7z, etc.) but based on the maximum file compression, which format is the best? I’m sure there are better formats than 7z for compression. It doesn’t have to be common, I just want to know what is the best available, and I can’t seem to find it on the web…
The best I’ve gotten is from http://64.233.179.104/translate_c?hl=en&langpair=fr%7Cen&u=http://rlwpx.free.fr/WPFF/comploc.htm (Google translated from French).
However, an example of a list of file formats taken from IZArc’s homepage is “7-ZIP, A, ACE, ARC, ARJ, B64, BH, BIN, BZ2, BZA, C2D, CAB, CDI, CPIO, DEB, ENC, GCA, GZ, GZA, HA, IMG, ISO, JAR, LHA, LIB, LZH, MDF, MBF, MIM, NRG, PAK, PDI, PK3, RAR, RPM, TAR, TAZ, TBZ, TGZ, TZ, UUE, WAR, XXE, YZ1, Z, ZIP, ZOO.”
Clearly there is more to be covered…