hmm, clicksor seems like a newer more expandable advertisement program. Google ads have there ups and downs. There well known, but sometimes too simple for my liking. The way to do it (which this place offers) is to get other websites/companys advertising on your site. Which is hard unless its automatically handled (even though it says you get 80%)
Google or Clicksor both can add quality to your site, or completly ruin it. I would try clicksor tho because like i said they seem more expandable.
hope that helps