It depends on the availability of the fuel, and thus on where you go. It also depends on the quantities of what you want to cook. Finally, it depends on the outdoor temperature. Multifuel stoves are great for trips in the third world, in really cold weather, and for larger quantities. But they are fiddly, heavy and expensive. Gas cannister stoves are cheap to buy, expensive to run, light (the solo ones), topple over quite easily (the solo ones), and the cannisters can be hard to get. There are two valve types: screw on (most of the world) and bayonet (Camping Gaz, France). Primus do a few Duo models for both types of valves. There are also adapters, but then you loose some of the weight advantage. Unless you use a heavier cannister stove with liquid feed gas stoves work less well at low temperatures. Finally, alcohol stoves like the Trangia. In Europe, the fuel is almost always very easy to get, cheap, and safe. But they burn slowly. That is fine for a solo stove, just about OK for two, but a pain for three or more. The Trangia 27 really is only a solo stove, and the Trangia 25 for 2, 3 max. Using the Trangia 25 for 3 only really works with either the gas or the multifuel burner. For a Trangia 27 used for one, I think either of them is unnecessary. The Clikstand and the Caldera Cone are less convenient ultralight alcohol stoves.
Willem