I have the Mr Heater mini buddy, buddy and big buddy. All work fine, but satisfaction depends on the heat you need for the space you are in. If a larger area, a model with a fan and connected to a 20lb tank is best.
I also have a Milwaukee M18 torpedo that I like and use more since I can heat up a larger area for emergency work purposes in unheated areas. The Ryobi M18 version is only $149.
I have the Mr. Heater tank top heater as well and it is great if you don’t need a fan. Quieter. Good for indoor temporary emergency use as long as the area is not air tight since it does use up oxygen — open a nearby window a little.