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It is hard to compare drag coefficients of race cars given their inherent purpose (handling vs. speed) because of the body parts that are their for downforce. I just read a book last week on Formula 1 design. Over the years the cars have changed because of the designer's schools of thought and partly because of the rule changes.
The OP was asking about one specific body design, assuming that the full body was already chosen. I would guess that unless you could design the fender flares to serve an aerodynamic purpose, such as directing the flow of air to where it is needed (the Nissan Leaf's headlights direct air around the side mirrors for instance) than a widebody would be the answer simply because of it's lack of protrusions, plus this would give you a bit more room to taper the front nose as well.
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