I've just had the 5" Firebox for Christmas.
It's versatile. You can use it with the meths or gas Trangia burners, sticks, larger pieces of wood in a Swedish torch configuration. You can also use charcoal briquettes to give you an hour long burn. Check out the Firebox Stove channel on YouTube. You'll see how well it has been designed for airflow, but also for cooking with different pots and pans, to baking bread items in the Zebra Billy pots etc. It really is a comprehensive bit of kit.
It is a touch heavy if you're thinking of walking far with it, however, I'd get the Firebox Nano for that, smaller, lighter and still quite versatile.
The Firebox stuff is really top quality steel, although you could consider getting the Titanium version to save weight. Can't wait to get out and use mine!!!