Schrader valves or Presta valves?

I have just got a new mountain bike that came with Presta valves in the tyres instead of the more common Schrader valves, fortunately I have a bicycle shop near me and I was able to buy a special adaptor that fits over the Presta valve to let me inflate it with my foot pump. It got me wondering why there are two... show more I have just got a new mountain bike that came with Presta valves in the tyres instead of the more common Schrader valves, fortunately I have a bicycle shop near me and I was able to buy a special adaptor that fits over the Presta valve to let me inflate it with my foot pump.
It got me wondering why there are two different types of valves and which one is better
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