This has turned into a anti-single trigger rant. I much prefer a single trigger. The 'instant selection' feature of twin trigers is much overrated, as is the supposed mechanical unreliability of a single trigger. The single trigger was perfected a long time ago. There is zero excuse for one that does not funcion with 100% reliability. If reliability was really a problem, one would see only twin trigger guns at important (money) shoots, this is not the case.
Selection is another matter, and again much ado about nothing.
My favorite selective trigger is on my trap doubles gun. It has a set screw preventing the selector from being moved. This might be an advantage in the field also! See bird, shoot bird, no fiddling with buttons or thinking about which trigger to pull. Anything that allows you more nanoseconds to read the target path, will help you shoot well. Make mine single, NON-selective.