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That one comes a close second for me. Just like you, I like the original more than the 2.5 variant.I'm a sucker for the original KH2 version of The Encounter, the definitive Disney villain theme.
The BBS/KH2HD renditions kinda change it a bit & made it sound less serious though.
Really don't like that change.
I like Vim and Vigor, how could I forget about it! D:Glad you said KHII, otherwise the choice would've been much harder.
My favorite would be Tension Rising, but I don't really consider it a "boss song". It's rather a "nobody battle theme" to me.
So I'll go with this: