The tradeoffs for equipment for single-platform use are relatively simple.
The shipboard choice indicated by a formal tradeoff study almost always
results in the use of 60 Hz, 3-phase power at either 115 VAC or 440 VAC, the
latter being centrally transformed to 115 VAC or some DC voltage, such as 155
VDC which is the voltage obtained from line rectification of 3-phase 115
The aircraft choice indicated by a formal tradeoff study almost always
results in 400 Hz, 3-phase power, at 115/200 VAC with consideration given to
future 270 VDC operation, since the extra cost in system tradeoff penalties is