What would be the best type of portable heater to use in a power outage in my small home? Propane or Kerosene?

They both can give off CO and need some ventilation. With either one you need a CO detector. I would choose propane. Kerosene is messy and it stinks. No matter how careful you are there will always be that smell. You will also have to store the kerosene somewhere safe. Remember, none of those heaters can be operated in a confined space. They need ventilation. Safety has to come before comfort.