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I setup a page that would display kanoodle and adsense with each alternate page view. Adsense gave me $30 at the end of the day, Kanoodle gave me $1.
Granted Kanoodle's ads were way off base for my site, your experience may be different.
I've had both: lots of clicks and no sales / a few clicks and a few sales.
It's so cheap that you may as well just try them all instead of agonizing over $10.