I own both. In my opinion the Swamp Rat Camp Tramp is easier to use because of the Res-C handle. I have a hard time hanging on to the Ranger knife during heavy or wet use. I tried to talk to Justin about my concerns when I met him at the Blade show in Atlanta last year, but he did not seem to be interested in hearing my opinions.
They both seem plenty tough and the RD-7 has the advantage of being readily available and relatively inexpensive.
Bottom line: If the budget was not a limiting factor, I would go shoping for a Camp Tramp. If the budget is tight, the Rangers seem pleny tough enough.