A way of quantifying how aerodynamic beaters are, Conker 3 has 2 2.7Ah 6S Lipo's driving its weapon. If I floor the weapon, it goes from 0-11K RPM in under 1 second, and then will drain the batteries flat [Or more specifically to the 3.2V cut-off point built into the ESC I use] in under one minute! [Keep in mind the fights can be up to 3 minutes :P ]
That said, provided they are designed right [the first beater for C3 wasn't strong enough so it bent], they are much easier to make and probably cost less than drums [not sure on that but you use maybe 2-3 steps & less material, where as drums require more complex machining and a big billet of Alu/Ti for the body]
A point against beaters is that usually they don't tie together the front bulkheads, where as a Drum design does which makes it much stronger. Beaters are vulnerable to having their bulkheads pulled apart by horizontals for this reason where as drums are less likely.
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