Both are good products and there owner/operators of both on the site. Another alternative you may want to consider is to use a coal fired boiler to to heat a water-to-air heat exchanger in your air ducts.
Using a boiler has several advantages, first you can use it to heat your domestic hot water, which can be up to 30% of your monthly heating bill. The other advantage is that water can store heat and then provide heat on demand instead of waiting for the coal fire to ramp up to heat a furnace.
A boiler can be located just about anywhere, possibly making the install and service of the appliance much more conveninent. Such as installing it near a door, so toting the coal in and ashes out is less of a chore. Or many of us put the boiler in a garage, or outbuilding and pipe the water into the house, this keeps the coal, dust, ashes etc out of the house.
Just some food for thought.
Welcome to the forum, Greg L