The only reason you don't see more people using Trigger Irons is because they are cumbersome to carry and transport. In contrast, a stick iron can fit anywhere without taking up much space. Trigger Irons can also be a bit tricky to use in tighter areas but the speed with which they build and hold temp is unsurpassed by most Stick Irons unless you spend a bit more on a higher end model.

For the field, I used to have a butane soldering iron that was far better than any iron I've ever used but it's impossible to find a butane iron today that gets to that temperature so I carry my stick iron at all times.