I own a BK&T BK9, and a Campanion. I also own a Swamp Rat Howling Rat. Although I don't know nearly as much about knives as most of the veterans here, I have this to say about the two brands.
BK&T : The Campanion is a stout knife. Very thick, seems to be made for abuse. The handles fit me, though I wouldn't mind them slightly textured. I have medium/large hands. No corrosion on my blades (I tuffcloth wipe every knife I get immediately, and after prolong use). Coating has begun to wear slightly on my Campanion (though I did stab it to the hilt into a (mostly) dead tree). BK9 has seen no practical use, but it scares me some. I feel a sense of power when I handle it, like God must feel when he's holding a 9" blade... The Campanion came with a kydex sheath that had some cosmetic damage, but otherwise functions well. The BK9 sheath was kydex lined cordura (or nylon). The utility pouch with elastic velcro cover is a nice touch. BK9 rattles when shook in sheath.
Swamp Rat : The Howling Rat exudes quality. It is a solid knife, whose meek appearance belies its inner purpose. Respirene C (the handle material) is awesome. However, I find the Swamp Rat handle to be slightly small for my hands. I don't know if the handles are the same ergos/size throughout the entire Swamp Rat line. The Swamp Rat steel is known to be better for most applications. Crinkle coating is well done, also. Sheath is a snug fit, with an awesome double velcro tab, so you don't have to remove your belt to attach the sheath. I am not a fan of the "button on a string" method of securing the knife (nylon patch with a button secured by paracord to wrap around hand, then snap onto front of sheath), and much prefer the button/strap on the Becker sheaths (hope this makes sense).
If you are planning on having a custom sheath made (as I am) the sheath points become rather moot.
Conclusion :
Will I buy another BK&T? Yes, I will probably own a Crewman before my knife collecting days are done.
Will I buy another Swamp Rat? Yes, I will probably buy a Camp Tramp before my knife collectin days are done.
My overall recommendation is, if you have the extra money to spare, without question buy the Swamp Rat. If that extra money needs to be spent elsewhere, buy the Becker. Understand that the Swamp Rat warranty will pay for itself if you ever require it..."No questions asked" is very difficult to beat, IMHO.
Those are my experiences with both knife brands.
From personal experience, I can say that Eric Isaacson from Swamp Rat is an excellent person to deal with.
Will Fennell from Camillus/Becker has very high regard on these forums, from what I have read as well.
I'm not sure you can really go wrong with either of these excellent brands. For the money, they are both bargains.
Hope this helps in some small way (if you haven't already purchased the BK&T. If you have, I'm sure you'll enjoy it!)
Regards,
Shaun.