The perfect case of the classic showdown

The 13" MBA has a 1.7Ghz ULV core i5 but the 13"MBP has a 2.3Ghz full voltage core i5. The biggest speed determinant that I can find is the HD so,if you get the 128Gb SSD in the pro then the pro and the air are the same price and same spec (except for CPU obviously and slight screen resolution difference). How much of a performance edge the does pro have? Also, since the graphics are integrated wont the extra voltage and higher clock boost graphics performance? Im sorry to make a whole thread about it but, I have searched all over the web and cant find a conclusive answer. Is there much of a power gain to be had with the pro? Is it just in processing or are graphics better too? Is it worth the bulk?