There is of course the thing about strength of rim, a big hole drilled in it to accomodate the schraeder valve weakens the rim, particularly so with thin section rims, so with them a Presta valve would be preferable.
But that old British staple the woods valve, how simple can you get, all that thing was, was a thin rubber tube and spit, perfectly serviceable in the field and what that skinny bit of rubber tubing is for in bog standard general purpose puncture outfits. Woods valve's were also very useful for rapid deflation too, and I remember good for letting your pal's tyres down, just unscrew the valve clamping ferrule and away they go.