All couplers except Rapido are supposed to interchange. Some brands are more/less reliable than others, especially when used with couplers of another brand, but they WILL all hook together.
Despite their good reputation, in the last year, I've had more issues with new MT couplers than I have with Accumates......sad fact is, none of them are 100%. Sometimes a little TLC will help, sometimes not. At our last show, I had a bunch of new cars I was trying out......I don't fiddle at the shows, so if a new car has problems it goes in a fix pile.......at the end of the show I had 6 cars that gave me trouble. 1 had Accumates, 1 had McHenries, and the other 4 were MT equipped. The McHenry had a lost spring and got replaced with MT's, The Accumate was a trip pin issue.....I removed the trip pins, problem solved. One MT was also trip pins, 2 were molding flash on the couplers themselves that was causing binding. The last was a passenger truck, and I still haven't managed to get it to work....I've adjusted and treaked everything I can think of and it still won't stay coupled.
Bottom line is if you don't use magnetic uncoupling, the trip pins on couplers serve no real function (unless you like the look) and removing them will improve reliability. So save your money.....try your cars before you automatically replace the couplers. At $4-5 for replacements you'll go broke if you automatically change.......but don't be afraid to change out problem causing couplers.