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The Kobo firmware supports both CBR and CBZ. When reading these, the default will be to fill the screen with the image. You can also zoom the images as needed.
PDFs are more complicated. Some are very slow, but there isn't a good pattern for this. The real issue is that the screen size is too small to make reading most PDFs comfortable. Most need a larger screen and the navigation in the default reader leaves a lot to be desired.
The best thing you can do is try them. Put a sample of what you read on the device and read them. If you don't like it, then try different formats or try KOReader.
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