I like the Svea 123 a lot. Once you get a hand for starting it it is quite reliable and dependable. Doesn't simmer worth a damn. Using a 'burner gauze', a bit of wire mesh with some fireproof fiber on it that spreads out and mellows the heat, helps but it never gets below rolling boil. Svea 123 really only has three settings: off, medium, and 'blast furnace'. It also only likes to run on white gas.

For urban bug-ins, car kits, power outages and other short term use a single-burner propane unit stores well, is quick to set up, completely un-finicky, and very reliable. You can quickly and easily melt snow, prepare hot drinks, and simple meals with minimum fuss and muss using standard propane bottles that are widely available. All at a very reasonable price. Add a single mantle propane lantern and you have warmth, cooking, and light.

These low-end propane units are heavy for hiking but perfect for car and canoe camping.

Playing with metaphors I suspect the 'best stove' is the human body. Stuff food and water in and you get warmth and energy.