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Almost always unless you can be sure they will be displayed on a large tablet. Even then somebody can increase the font size and blow up the table.
You might want to experiment with different types of images, gif, png, etc to see what gives you the best image for the least memory consumption. Probably not too big a deal if there are only a few of them.
HTML tables can be hard to center as well, without messing up the formatting inside the table.
Images are pretty easy to snapshot out of the pdf. Just make sure your viewer program snapshot is set to as good a resolution as you need.
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