Schraders are for cars and trucks; prestas are for bicycles. Wasn't that easy?
I have convertible "bilingual" floor pumps to handle both, and I have kept a presta-to-schrader adapter screwed onto a bolt (water bottle clamp, downtube shift clamp, whatever is available) on every bicycle I have owned, in case I ever do need to inflate a tire at a gas station.
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"Far and away the best prize that life offers is the chance to work hard at work worth doing." --Theodore Roosevelt
Capo: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger (2), S/N 42624, 42597
Carlton: 1962 Franco Suisse, S/N K7911
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1982 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069