Pretty much what Joe said.Vector is better looking and smaller files. But if a customer decides to open it with XYZ pdf viewer it may not look right if XYZ doesn't support transparency and later PDF content. And even sometimes they won't be looking at what will actually print even if they use Adobe Acrobat Reader and they don't have overprint preview enabled. We ran into that about a week ago. The only way to make sure the customer is viewing what it will print like is via a raster file...assuming the path to raster isn't changing something. In prepress there is always the possibility to lose no matter what you do.
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