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The 55-250 is very sharp for the money (compares pretty closely with the 70-300 which costs twice as much). The 18-200 is a decent superzoom, but suffers somewhat at either the wide or tele end compared to dedicated wide angle or telephoto lenses. If you're only going to carry one lens the the 18-200 is a reasonable choice. If you don't mind a 2 lens walkaround kit the 18-55 and 55-250 were designed to be just that for EF-S bodies.
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