I find that the 8-10 inch blade can do anything I need to do, including small stuff. The big stuff can only be done by the big blades. I am not confortable chopping with anything less than a SH. The SJ are just too light to be effective. The NO's are a little better in this regard. But the SH's are the minimum all arounder. The BM is a bonus IMO. Try batoning with a smaller blade and see how often you have to pull it out and re-adjust to continue. It is a pain when you are doing a lot of batoning.
Also the blade geometry of a 1.87 inch wide blade at .27 inch thickness is way better than either the SFNO or the SJTAC. In fact it is better than a spyderco military, trust me I have calculated it. An SHBM has better blade geometry for cutting than a Spyderco Military for 90% of it's useable edge.
I have done everything with my SHBM. I have used it as a machette, an axe, a maul, butcher knife, vegetable knife, butter knife, pry-bar and more. It is the only knife I have been able to use for that. The balance is just perfect for me. It even throws well. I can stick an SHBM into a log from 20 ft away 20 times out of 20 times. I can sever 1.5 inch branches with one blow and 3 inch branches take a few more blows. I am sure the FBM and the BM-E are every bit as good. My BM-E's have a more secure grip, but when I go full power, the grip doesn't feel as perfect. When I do finer work, the BM-E seems a little better.
So when I go small, I go real small. The Badger or smaller is my choice and the BM is my large knife choice. To me the SJ and the NO are compromises that I do not need, unless I am in the city.
Bring out the Badger with no rear talon hole for the most compact handle possible.
try chopping this massive log with an SJ
I almost missed with that throw.