Any game where after you beat the final boss they dump you back to before you beat them effectively erasing your victory.
Didn’t they release a free update that finally ended it? I know the original ending was just kind of there but that was so that they could build off of DLC (both free and paid) because of “games as a service” nonsense. I haven’t went back because the roguelike dlc held no interest for me but I remember reading something about a final update that actually ended things.
I hate this example. To show the consequences of all the players actions would have taken over an hour for a cinematic so they flash the important bits and let you decide how it effects the rest yourself. Most of your previous decision consequences get summed up in the war assets like if you save the bug queen in 1 and then again in 3 you get bug builders because she was able to fight off the mind control whereas if you killed the queen in 1 and saved the new one in 3 they bugs you get sent turn hostile.
Honestly no real difference atm as I’m assuming your kids are younger and exclusives are generally more mature games. If they have friends with one then I’d go with that so they can play together.