Some rambling thoughts to consider..... I have a BK-2, BK-15, BK-16, BK-7 and a couple of their neck knives. I seldom use the BK-2 and believe I would be much more comfortable with the BK-10. So, if you are thinking of something in this blade length, get the BK-10 rather than the prybar BK-2. I like the BK-7, but hesitate to actually carry it on a hike. But some really like to carry a larger knife. Neither the BK-2 or BK-7 is great for chopping, and both work just fine for splitting wood for the fire (batonning) and I think the added couple of inches of blade would be helpful for batonning up to 4" stuff. The BK-9 is better for chopping and probably just about as handy for smaller tasks as the BK-7.
What do I do? First I don't do any serious backpacking and most of my hikes are dayhikes, some longish, but still a dayhike. I carry my Condor Pack Golok in my day pack and occasionally on my belt if I intend on playing. But normally I have about a 4" fixed blade on my belt such as the BK-16 or BK-15. The BK-15 is new to me and I'm still trying it out. I always will have a folder with me, and the detailed stuff will be done with a folder.
I more often car camp and I take everything but the kitchen sink with me. That would include at least one saw (Silky now), an axe, a machete, a large knife (like the BK-7 or Condor Hudson Bay), my 4-5" belt knife (such as the BK-15 or BK-16), and a folder or two. The machete (Pack Golok) substitutes for any needed chopping with a blade and the axe is there if I want to really do some chopping. If I were going to leave a blade at home, it would be the BK-7. If short machetes don't interest you, then the BK-9 will work well enough for camping and you can do smaller tasks with it. You actually can do everything with a $20 12" Ontario machete as you would the BK-7 or BK-9. But it's a lot more fun with the Beckers. (I hate the 12" Ontario machete... own three of them.)
Where am I going with this??? Go with a multi-knife approach for versatility so you are not abusing any one knife (like batonning a folder) and you have a suitable replacement if you should loose or damage one, or simply let a partner use your knife. Almost everything can be done with a strong 4" fixed blade like the BK-16, BK-17, or ESEE 4. You don't normally need to split logs for a camp fire unless you're just playing.
Ask Ethan Becker what he prefers or his favorite Kabar Becker, that would be the BK-16. He also likes the BK-9 for fun stuff.