The Jacksonville Jaguars aren't known for being the best team. Not historically, at least. Given that their mascot is such a fierce animal, that is surprising. Not that the mascot ever makes the team. These designs prominently feature the fierce feline, especially the top right design. This design is very cool, but it looks like something the mascot should be wearing, not the players.
The bottom left design is like the top right in many ways, except it is a little more subdued by adding the color at the bottom. The bottom right is the best option in my opinion. The logo is a good size, and the rest of the color pattern evokes the jaguar without being overly gaudy. I could see those helmets looking good from a distance and up close and personal.