> Schottky would be lower Vf than a silicon at higher amperage

A little more on that. Generally Schottky would be lower, but you
should check the I-V curve for a particular device. For example a
BAT46 has a much lower Vf than a 1N4148 over the spec range,
but the curves for comparable larger diodes may be closer at higher
amperages. eg at 1A, 1N5401 (0.75V) vs 1N5822 (0.52V)

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