I think it depends on what you want, each one has its pros and cons. The Krak-On's a bit slower than Carbon Rollers, and in my experience, beacons don't have as many purposes as seekers. But the Krak-on has a better special, and its extra weight lets you squish squids hiding in their ink, which the Carbon Rollers can't. (I've had a few moments where I would stumble across someone and then have them take me out in return)
Personally, I would recommend just trying it out for a bit, and if it works for you, alternate between the two. I used to just stick with the Carbon Roller Deco myself, but I tried the .52 Gal Deco and had a blast with it, and I've been experimenting with others. It's pretty fun to try out new weapons, and it lets you learn new strategies.