Fausto,
I have both a Swamp Rat Howling Rat and a BK&T Campanion. They are both very tough knives. Here's my opinion on each.
Howling Rat : Respirene C handles are smaller, and softer than the Becker's, but comfortable. In addition, the handle is sealed around the tang, there is no room for grit, food, blood to hide. Choil is a nice feature on the blade which allows some more precise control. The blade coating wears very well. Howling Rat is significantly lighter than the Campanion. I'm wasn't impressed with the factory sheath (I had a replacement made by OST). Convex edge, with great edge retention. Personally, I've found these harder to sharpen, mousepad or not

Unbeatable warrant. (literally, a "no questions asked" lifetime warranty).
Campanion : VERY thick stock ("0.230 I believe). Bombproof. Decent coating. Hard ergonomic handles fits well, but I find are less grippy than the Swamp Rat Respirene C. Superior kydex sheath with a number of carry options (heavy blade works best with a drop leg strap, I've found, especially if hiking, it prevents it from flopping around). More edge length than the Howling Rat. Excellent edge retention. A better chopper than the Howling Rat, but still a relatively stout blade, and inferior to almost any longer blade or hatchet. Limited lifetime warranty.
Both of these blades will rust on the exposed edges if not properly taken care of. My Campanion was purchased before the introduction of the Crewman. I would definately consider the Crewman as an alternative. If possible you should handle a Swamp Rat and a Becker before buying to see if their handle ergonomics are for you. They are both excellent knives and well worth the price.
Hope that helps.
Regards,
Shaun.