That pretty much removes the Mission, it is geared towards in general heavier use and really corrosive enviroments, more for survival than camp craft. As for the other two, it is mainly an issue of chopping (RAT) vs cutting ability (Dozier), the Dozier would also have better edge holding and ease of resharpening and better sheath. I also like Dozier's grips for versatility but the security is rather low, note the difference in the guards. I would suggest at least a light trial with both knives, just some work in the kitchen to check the cutting ability and some wood work if possible to check penetration and fluidity as well as handling characteristics. This isn't going to effect the Dozier beyond having to sharpen it and will likely only produce some slight wear on the Rat coating thus won't decrease resale significantly. A lot of these issues such as ergonomics and handling are very person dependent and you really have to check them out in use, so see how they react to the forces applied.
-Cliff