I have dismantled more than twenty, but less than a hundred, I’m reasonably sure. Might be getting close to that latter number.
Everything @RatMan said is gold. The sawzall is the absolute fastest way to disassemble with minimum damage. Assume that the nails will be spiral or ring shank, and usually galvanized (so avoid burning them). And assume that the wood is treated unless you have good evidence to the contrary.
The thing that you guys are calling a crowbar is properly named a wrecking bar or J-bar, but that is rapidly changing due to language evolution and the increasing majority of the English-speaking population no longer engaging in any real labor. You may as well call it a crowbar and be ahead of the curve, I guess.
I use a 3-foot wrecking bar and a splitting maul, usually, not because that’s the best way but because that’s the tools closest to the spot where I usually break them up. I have also used wedges and sledge, which I would say does more damage than the sawzall, but less than the wrecking bar, assuming you are reasonably skilled with the tools.