Tough Call.
I had a FBMLE that I loved (customized with hand shaped handles convex edge and an unsharpened top swedge added).
The ZKII is a chopping wrecking ball! I convexed the edge on it, and improved the bite. I may still want to take a bit of shoulder off. It is a big heavy sucker though. Lots of room on the handle. If I was doing a bunch of hiking, and had to carry my sleeping gear and food etc, it would probably be weight prohibitive (unless you are super Sherpa strong, or leave something else out to make up the weight.
The FBM is sweet. I love the look and feel of the CBT, especially when stripped. Still has the beefy tall blade profile of the fusion series with the least weight. Can't go wrong.
The B11 is a lotta choppa for the weight. Bites deep, and has the comfy shock absorbing handle. Most likely would be this one for lugging around. The weight to performance ratio is just off the chain. Very cost effective too. 200 less than the fusion series for the most part.
Also very cost effective, and lighter weight and more overall utility is the BWM series. If you can find one with the Comp finish, you are golden. The CG are great as well, but I love the convex zero edge, and the rough bead blasted finish on the comps. Thinner, and so they make a more nimble all arrounder than some of the beasties. You still get lighter weight, but the handle scales are micarta for those that think this is a must. You also get exposed tang (as with all the other FFBM, FBMLE, BWM, KZII etc) so you can hammer if you need to.
Really can't go wrong with any of them.