The impression I am getting is if you use a spray gun you will always get good results. I have use a spray gun for very large projects and there is a lot more knowledge needed than just pressing the spray cap on a rattle can. With a spray gun you need to get the right nozzle, viscosity, pressure, lacquer and other things for good results. You can get orange peel with a spray gun just as with a rattle can if things are not right. The other impression is that you can’t get a good finish with the rattle can and in my experience that is not the case. Properly done I don’t think a person could tell the difference between using a spray gun and rattle can on small pieces. The only large pieces I have used lacquer on is platters. For bowls I mainly use a wipe on finish. If I was doing a really large project the spray gun would be the best choice. However for the small size projects I do not want to drag out my spray gun for a 3-4” lidded box and deal with all involved when I can get good results with a rattle can.
As far as the trigger I have never used one. Seems to be more comfort than really using on large projects.