Well, the Death Star before roj had only one weakness on paper....the hole in the shell. The traveler has many holes so unfortunately I'm sticking with the Death Star simply because its name says it all...Death Star Yes I'm aware it got destroyed but it was basically icing on the cake as the it was more of an intimidation thing as their fleet dominated well before its construction...the traveler had to burn basically 99.5% of its power to save the human race; and still failing to meet the goal of wiping the threat. What this survey should say in my opinion is traveler or halo array as the halo array would have dropped a large chocolate fudge dragon on both as it was activated and successfully eliminated the flood threat with the Milky Way however, it's effect on flood in surrounding galaxies not so much it's like this to me Traveler (sacrifice power and failed as the darkness is still present)< Death Star (planet destroyer and ender of planetary population(s) it was tested on more than one planet< halo array ( the purge mechanism) Please disagree as I like the conversation curious to say of anyone agrees with me lol