It looks like the BTFS in the OP was the "original", with its first commit in July of 2015. Could be wrong, because the GitHub interface doesn't make it easy to get to the beginning of the 13k commits for go-btfs.
However it's good to see that Tron are no longer trying to hide the fact it's a fork. For a long time they didn't provide the source code of their btfs.
EDIT: Actually, since this was a fork, it would probably be a pain to hunt down, even with a local checkout. But it usually works.
(I have an alias specifically for finding that out)
Personnally, I don't care about any of the crytpo-mining-coining and I think the two are sufficiently distinct.
johang/btfs first commit: Sun Jul 26 10:20:49 2015 +0200