Wiki vs. Google Apps

This week for Edtech 102 I have been looking at Wikis. There are three advantages to the Wiki. Fist, it allows students to work collaboratively on the same canvas, both adding their own content as well as editing other’s. Second, Wikis retain older versions of the work allowing edits to be easily undone. Third, they track each individual’s additions to the Wiki, enabling the teacher to monitor each student’s progress within the group Wiki. These features make Wikis a fine place for constructing collaborative work.

I am trying to figure out when it would more appropriate to use a Wiki and when it would be more appropriate to use Google Applications. It appears to me that Google Docs and Google Sites should give you the same functionality as a Wiki. It appears to me that they are similar softwares and one’s comfort with the different programs will dictate which to use.