I started out with Swamprats. First the Desert Jack, then the Ratweiler, and finally the Chopweiler. The Chopweiler's humped back was too pronounced for me so I took it to a grinder and now it's become my "experimental" knife. I almost got it to where I want it 
The NMSFNO would be the closest blade to the Choppy. I think the Busse handle is much more comfy. Once you hold one, you won't really want to chop with a Rat.
If you really want to "trade up" get a FBM of any type...CG, Fat, LE, etc. You will not regret it.
Both families grind out some of the best utility blades in America. I won't hesitate to grab either a Rat or a Busse in a mad dash into to the outdoors.
The NMSFNO would be the closest blade to the Choppy. I think the Busse handle is much more comfy. Once you hold one, you won't really want to chop with a Rat.
If you really want to "trade up" get a FBM of any type...CG, Fat, LE, etc. You will not regret it.
Both families grind out some of the best utility blades in America. I won't hesitate to grab either a Rat or a Busse in a mad dash into to the outdoors.