I have a Geissele Super Dynamic 3g. It does not feel anything like the triggers in my hunting or LR rifles, ther is no defined 'break' point. Yet, I can hit targets out to 500 with no problems, at least no problems to do with the trigger.
All of the above mentioned triggers will probably work fine for 3 gun. If I were buying now I'd get the cheapest one and put the extra money into the optic.