Presumably, one's git hooks are not in danger of being lost to oblivion. If that's the case, neither bit of advice is ideal. If, however, one is careless enough

Presumably, one's git hooks are not in danger of being lost to oblivion. If that's the case, neither bit of advice is ideal. If, however, one is careless enough that unix plumbing with obliterate the hook for eternity, then appending at least allows the original to exist some place.