Different Engine Design Attributes

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Aight, the title pretty much defines my question. I've heard about the I6, F6 and 45* V12 being the smoothest engines. And then recently i heard something about the design of the V10, but I forgot what they said. Can someone give me a link to a site that explains the different designs and there pros/cons. Or better yet, someone post there favorite design and why they like it. Thanks very much, adios.