yes, well even though UHA has a better compression ratio, it isnt very versatile since not many people have it
great for backups tho.
since winrar opens the 7-zip files, i think 7-zip is the best - i would even go as far to say that .rar and .7z compressed maps should be allowed to be uploaded to the map vault
well...rar at least
anyway, i wanted to know the info for myself, and i thought i may as well post the results here