If your dead set on one of the three, I vote for the FSH, the thinner the better. I echo Voxhog's advice. The NMSFNOLE or the standard CG would be a better choice. The FFBM is a pack/car knife. The SJTAC is a fighter/utility knife.
I've tried several FSH's and I almost always wished I had a FBM when I was chopping with it. When I was carrying it I always wished it was a NO. So, go with a NMSFNO. I've got one and I really, really like it as a "one knife" option.
GregB
BaconBeavers
I agree the FFBM is a car knife IMO as well. However, I wouldn't ever put it on my pack. Still too heavy and now not conveniently accessable - especially when discussing "ONE" knife. But, that's me.
And while the SJTAC is somewhat a fighter or at least could be, I think it is a GREAT utility knife!!! :thumbup: ..... where most fighters are not. I think a LOT of people are missing how great the SJTAC is as a user. But, I have modified mine. My main modification was to remove the top ramp.... It wasn't right for me. And without the ramp, I think the SJTAC shines as a GREAT utility knife! Reasonably lightweight, VERY well balanced, nimble in the hand, one of the BEST blade shapes for utility use IMO, and pretty good handle ergos with minor tweaks. Not a great chopper, but heavy duty enough for MANY functions. With some bushcraft skills, the SJTAC is an AWESOME size for a "ONE" knife scenario.
A "ONE" knife scenario is ALWAYS going to be lacking something somewhere and ALWAYS going to compromise something. Either too big for many chore/utility tasks or too small for heavy duty chopping, beating, prying tasks. Some will always say and believe that a large knife can do small knife chores and a small knife cannot do large knife chores. I agree to a Point. But, not entirely. I can do large chores with small knives and small chores with large knives. It comes down to efficiency to me. A knife sized like the SJTAC is somewhere in No-man's land. It isn't large enough to do large chores efficiently and not small enough to do much of the detail chores as well. But, it has a GREAT balance of abilities if looking for "ONE" knife and know how to use it.
In reference to the FSH vs. the NMSFNO, I think the FSH is just a bit better chopper and the NMSFNO is "maybe" just a bit better all-rounder.
I agree the FBM and similar longer, larger, heavier knives will always have the upper hand for chopping, but always at the expense of being heavier than "I" want to carry and heavier than most really want to mess with for carry. So, a "CARRY" knife will in most cases compromise some chopping ability for versatility. I consider 20 - 22 ounces pushing the limits of what I am willing to carry and actually more than I prefer. But, YMMV.
The HH is VERY heavy. I used to have one, but never weighed it. I would assume it is somewhere around 26 - 28 ounces.... **** If anyone has one, I would love to know it's weight.
I know there are a few variants of the FSH, but mine being the full flat grind at 0.27" thick is FAR from the heaviest FSH at 22.0 ounces. Personally, while still pushing my weight limits, I think the full flat FSH feel and balances quite nice for it's size. But, still, at 22 ounces, NOT a lightweight knife IMO.
The weights on the NMSFNO's should be mostly comparable within a half ounce or so (except G10 probably weighs and extra full ounce). My NMSFNO weighs 21.5 ounces and I would call that pretty darn close to my FSH in weight and carry.
A debate between which is a better "ONE" knife between the FSH and NMSFNO is a VERY worthy debate. Personally, I think the HH is TOO HEAVY for a "One Knife" approach. But, to each their own.
To me, the key part of the question was: "one "do it all" Busse that can still be belt carried".
Obviousely, opinions will and do vary, but with those parameters, "ONE" do-it-all knife that is still O.K. to carry, I still have to ask how important "Chopping" really is. I know a lot of people have "Fun" chopping. But, out on a trail, hiking, camping, what-have-you, do you guys really chop that much??? I don't. I chop more for fun than need. I can break limbs for firewood easier than chopping. Etc. etc. on more efficient ways around chopping. I DO use my knives for utility purposes and rarely need such a big knife. I prefer carrying lighter and smaller knives are much more useful for utility purposes. But, that is me.
If chopping is a MUST, and still to be acceptable for carrying, the FSH and NMSFNO are worthy considerations.
But, if like me, and want to save energy and not chop, be efficient with firewood prep, still have a knife capable of doing a LOT with some know-how, but only limited to ONE single knife (which I don't do), I would still have to consider the SARSquatch a top contender and the SJTAC highly worth considering. The Skinny ASH and Hell Razor wouldn't be bad either. But, I easily prefer the SARSquatch and my modified SJTAC over my Skinny ASH and HR.
For me, I will ALWAYS also have a 3.5" - 4.5" "Primary" user option.

:thumbup: ... and "Sometimes" "supplement" with a larger option.

- Having this smaller knife option, makes me lean towards the SARSquatch or FSH/NMSFNO as the smaller knife compliments the larger knives better. Without the smaller knife, I lean towards SJTAC or SARSQuatch. In either case, the SARSquatch is a worthy consideration IMO. :thumbup:
NMSFNO
.= 21.5 ounces; .25 thick; 8.25 blade; 14.0 oal
FSH (full flat grind)..= 22.0 ounces; .27 thick; 8.1875 blade; 14.4 oal
Many variants of the FBM will have slightly different specs, but:
FBM CG
.. = 27.1 ounces; 0.25 thick; 10.0 blade; 16.0 oal
FBM LE
.. = 30.0 ounces; 0.312 thick; 10.0 blade; 16.0 oal
FFBM
. = 31.4 ounces; 0.32 thick; 10.0 blade; 16.0 oal
NMFBM
.. = 29.5 ounces; .25 thick; 11.3125 blade; 17.5 oal
Some others mentioned:
SARSquatch
= 17.0 ounces; .1875 thick; 7.0 blade; 12.75 oal
SJTAC
.(stripped)
. = 13.0 ounces; .187 thick; 6.375 blade; 11.875 oal
Hell Razor
= 14.75 ounces; .1875 thick; 6.625 blade; 12.75 oal
Skinny ASH (ASH1)..= 15.25 ounces; .1875 thick; 6.4 blade; 12.0 oal
ASH1 CG
.= 21.0 ounces; 0.320 thick; 6.4 blade; 12.0 oal
.