The only difference is that the LED can use a low-side switch (N-MOSFET source connected to ground with the LED connected to the drain and going to V+).But apparently switching the 12V battery-converter-camera is different from switching, say, an LED (which I think works with an N-channel MOSFET)?
No, the leakage of either type of MOSFET is negligible for your purposes.Would the P-channel design leak more current?
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