You can see from the Titans colorful logo that they have a lot of colors to work with when designing a helmet. The mix of white, red, and two blues makes for a striking logo, and a lot of color to play with. All of these designs make really interesting use of the color scheme and logo. The giant sword in the top right is visually striking. No one is going to have a hard time making that out from the crowd.
The bottom left is straight up funky. I appreciate the bold design, but it doesn't properly evoke the Titans. The bottom right design is a good alternative to the top right, depending on which color you like featured more prominently. White background can help objects stand out a little more, which is what the background does for the sword.