ok so here are my totally unscientific tests of 3 diode type of things, that i applied to my (very) low-voltage system, to see what has the least Volt drop, or losses in MY situation.
normal cheapo rectifryer diode to start
the shotkey had (about) 1/3rd the voltage drop, pushing the same current through it, with the same current specs.
its package size was about 1/2 as big, with less Loss there is less Heat for it to dissapate.
the Mosfet (burn my fingers will ya) had (about) 1/3rd the drop of the shotkey BUT only after i triggered the gate High enough to get it to fully switch, . umm right BEFORE that, there was flesh burning smells :-) , but i quickly sent more voltage to the gate. the mosfet was capable of handling 10TIMES the current, of the other diodes, and its a good thing too, because untill i hit it with high enough gate voltage it was very high in resistance (dissapating much power in heat)
So basically what i learned was, dont stick your finger . . . oops, not that, i learned that shotkeys blow a normal diode away for this, and mosfets blow the shotkey away, as long as you have reasonable voltage. (in my particular application)