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I think the ideal shape is neither the forward teardrop nor the reverse one. The objective here is to avoid a detached flow- the forward teardrop pushes a sizable wall of air, the reverse one allows turbulence to form at the end face, increasing drag.
The Ideal shape would be a combined teardrop with the front end formed by a reverse teardrop tail and the back end formed by a normal teardrop tail. The intermediate section can be tubular shape that then reaps benefit of a parting already taken place - something like the bullet trains of Shinkansen Japan or TGV France.
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