The bottle shape casts better.
I suspect the straight shape fishes a bit better, but that's not said with any confidence.
I will say that poppers are deceptively difficult plugs to "get right".
The face angle, cup depth, and even line tie position have significant effects. The weighting scheme also seems more subtle than I anticipated. Tail heavy casts best, but belly weighted work better.
It is easy to make a plug that pops, but getting one that does so at the right speed and without tumbling is not so easy, and getting one that swims as well as pops is downright difficult.
Finally, cutting a wide shallow face on the larger ones causes me all kinds of issues. Deep faces are easy, but often create too much resistance.
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