WHat is better for a rocket? (Black powder/kno3 and sugar)?

I and depating on making a model rocket with BlackPowder or the kno3-sugar mix wichone is stronger wichone burns longer wich one reaches higher distancesWHat is better for a rocket? (Black powder/kno3 and sugar)?
If you've never made a rocket before I suggest starting with Black Powder. While the KNO3 can make a better rocket propellant it is not nearly as forgiving as BP and it's much more diffiult to cast consistent fuel grains.WHat is better for a rocket? (Black powder/kno3 and sugar)?
KNO3/Sugar or Rocket Candy, like it is called, is far better than black powder. It has a more even combustion and higher specific impulse.





If you want even better efficiency, I think it was Sucrose or another sugar replacement which gives you a higher impulse.