Why don't you see if you can get on a FAM visit with them. Then you will know for sure if indeed they are your favourite choice. As I was told recently, "Go with your gut, your gut won't be wrong!" Good luck.
That's a good question.I did my own FOOing in one war,and I was a sapper! Ah,I also had an FAC instructional course(1 day) and 30 mins on 81mm mortar.Seemed to do fine for the next 18 months!At least I did not kill any of my own blokes.However the gunners did manage to fire a 5.5 inch airburst round over me,and fire an FPF task,without my confirmation!There again,I did not see too many gunner officers drilling for water,building airfields etc.... They had a very nice gun position on a beach and ate crayfish every day,which-more or less-marched out of the water!