netmeg - 3:15 pm on Sep 20, 2007 (gmt 0)
Try both and see which works for you. If you're familiar with PHP, it's very easy to serve up different pages randomly and then test which ones do best with AdSense Channels. I haven't tested placement yet, but this year I tested link color, and was amazed to find out the red links did much better than the standard blue ones, and nobody liked green. But that was only one site - there's another site with an essentially black & white color scheme where ONLY blue links seem to work well.