The Gilbert uncouplers are the best because they have the most forceful action. The SHS/MTH (I have some of each) work well with the couplers on SHS/MTH cars and with the couplers on AM cars. The new Lionel AF cars open fine but the ones made prior to 2019 have coupler jaws that do not always open wide enough to separate. That is a coupler design problem, not an uncoupler problem. The original Gilbert couplers open as long as they are well maintained. With age some of them resist opening.
If we arbitrarily score the Gilbert uncouplers a 10, then the SHS/MTH are an 8. Not quite as strong and less forgiving. I do not have any FasTrack uncouplers for comparison. I also included some actuating rails for action cars but rarely use them.
The problem I have is the yard uncouplers are not real easy to spot and when the yard is full of cars it is almost impossible to accurately position the car couplers above the uncoupler so I do end up manually uncoupling cars. The ones on the mainline and sidings are easier to spot and use.
It is hard to tell from that picture but there are 12 sidings in the freight yard. Since it is a peninsula it is easy to reach any car on any siding.