pbwiki vs wetpaint

I was all set to love wetpaint, forewarned that it was more design-y/creative, but while the template choices were very good and fun, I find the ads overwhelmingly distracting. So much so that I would not set up a wiki there. And, for sake of argument, I set up an account at wikispaces as well - it's very spare, not so many colors and distractions.
However, form follows function to greater degree with wikis than blogs; it seems to me that blogs are our personal spaces, and while people should and do visit those spaces, the creators are the only ones obligated to work in them. Wikis can be personalized, but the visually busy look detracts (and distracts) from the work.