Can't even choose. Probably Fortnite. But I would insist that they are different games from different genres, and it's weird to compare them. It's like comparing an airplane and a car. These are two different means of transport, and they serve different purposes. The same is with these two games. They are different and mostly made for different auditoriums. One is a shooter, and another is a sandbox game. If you look at the minecraft server list, you will see that they are mostly intended for construction and not for action. Fortnite, on the contrary, is mainly concentrated on action, and construction is only one of the means to defeat the enemy.