I use a 1 ring gas stove, portable BBQ and kelly kettle (this is less practical but fun, but does boil water and cook). I never have EHU. This is usually for 2-3 people at a time.
My BBQ is a Lidl middle aisle buy which works fine, but DB has a proper Webber portable one which is much more controllable because of the lid, and has a larger cooking surface. You can cook a lot on a BBQ - not just grill meats, but make skewers of veg, foil packets of all sorts, bake potatoes in the coals, put a pot/kettle onto spare space on the grill while cooking (especially useful once finished cooking to heat water for tea/washing up later!).
On Cub camp, cooking for up to 28 people, we use 2 sets of double gas rings - they're larger than the suitcase size so can take large pots, and use a proper bottle of butane so burn hotter than the smaller cannister style. I usually only use 3 rings (2 x25l pots of pasta and 1 of sauce, or 2 pans for french toast and the kettle for leader's morning coffee, etc).
But my little 1 ring does me great most of the time, I don't have shelter to cook under (if the weather is really that bad, we head for a local indoor option or grab a rotisserie chicken en route back to tent to have with bread/salad), but mostly it's fine and I just throw on a jacket if there is a bit of rain.