Based on the community feedback, the Canon EF-S 18-200mm IS is the better choice if sharpness and lower chromatic aberration are your priorities. The Canon is described as having higher-grade optics, which likely explains both the better image quality and the higher price.

That said, the practical difference may not be huge for the kind of general-purpose shooting these superzoom lenses are designed for. Both should perform similarly enough for everyday travel and convenience use, where zoom range matters more than maximum optical quality.

So the short version:

• Best image quality of the two: Canon
• Better value/convenience choice if expectations are modest: either will do fine
• If CA and sharpness matter most: choose the Canon