Thanks Chiral, I was going to post something similar, but far less detailed, or informative.
My understanding is that the BOB is a low saber grind, with a small secondary grind (somewhat similar to a scandi, but with a secondary bevel), and is out of 3/16in stock. The BK16 is a FFG grind on a 5/32in thick blade. Neither is really "better" in a global sense, but for certain tasks one will be better than the other. The TOPS should be much sturdier, and will baton/chop better. The BK16 should do slicing tasks better(where the the blade goes more through the media).
My main "argument" (or maybe just thinking point for the OP), is that I've found that knives in this size range aren't really worth chopping with (if anything, cross grain baton. Its FAR more effective with knives this size), and batoning is somewhat limited by blade length. Realistically you won't likely batonning stuff much bigger than 3in - 3.5in or so. And unless you have a crazy knotted piece of wood, that size wood shouldn't be too hard to split with either knife.
For what its worth, I've used BK9, Mora, and Corona saw for a few years now, and I ended up getting a BK16 for very similar reasons. Its plenty strong for what I need, I just know I can't abuse it like I can my BK2, but the rest of the time I quite appreciate the less weight, and the good cutting performance.
So really you just need to decide what you're wanting. They are similar sized knives, but they are trying to do fairly different things. So deciding which part of your requirements is most important and going with that should make you happy.
Good luck making a choice

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