I don’t think the band matters that much. The spec sheet is much more important than the brand imo, the efficiency at low temperature in particular.
Another thing: having good insulation is really important to fully appreciate heat pumps. My house is a new construction and very well insulated and that’s why I could get away with such a small heat pump.
Let’s be honest, a fallout outside USA would render the weapons and ammos as rare as Elon Musk’s well thought out tweets