Style one has 728x90' 160x600 and 336x280 units
Style two has 728x90 and two 336x280 units
Logged into my adsense account, and google recommends(they "ran an experiment") changing 336x280 to 300x250 on this site.
Says I should earn a little per week more?
Question is which 336x280 units are they recommending that I change - all of them? Some of them? Should I take a guess?