I own a roughneck and I’ve done some research on the models you mentioned. IMO the roughnecks, retriever jons, grizzlys, and predators are all very similar in design/quality, cost, and features. My personal favorite is the predator and if I could have my choice my boat would be the 18′ predator tiller.
Alumacraft’s waterfowler mod-v seems to have lagged in design and features IMO.
Another thing to consider is that with some of the “package” boats you are also limited to your choice of motors. For example, its surprisingly hard these days to get a mod-v with a yamaha motor. Yamaha owns G3 but their mod-v’s seem geared more towards hunting than fishing… and they have limited tiller options.
For cool-factor, the war-eagle, havoc, and excel boats are pretty sweet!
JP