Erm. You already listed the differences yourself, what more do you want people to do for you??
As for picture quality, it's hard to compare since the focal ranges only overlap at exactly 55mm.
Read the reviews of the lenses in the links that were already provided to you, and learn for yourself.
oic, got what u mean. VEry Thank You for the reply.
anyway I am not so interested to find the different between 55-200 USM/55-250mm IS. that's someone question.
