if you needed to propel something in space and you only had a canister of oxygen and hydrogen what would be better?

Question: if you needed to propel something in space and you only had a canister of oxygen and hydrogen what would be better?
- Keywords:
  hydrogen,
  oxygen,
  space
Asked by Blakedunne to Sheila on 15 Nov 2018.
- Sheila Castilho answered on 15 Nov 2018:
  
  that is a very tough question! To be honest I have no idea as it is very far away from my area but your question is really good and specific! Maybe you’ll be a future chemist, physicist, astronaut? =)
  
  But I found something on hydrogen and oxygen for rockets by Nasa: https://www.nasa.gov/topics/technology/hydrogen/hydrogen_fuel_of_choice.html
  
  Hope it helps!

Question: if you needed to propel something in space and you only had a canister of oxygen and hydrogen what would be better?