honestly, I'd say whip.
it hits 2x as fast as the godsword.
and I've hit around 470 with a whip.
that means I could hit 940 before a godsword hits 1 time.
but I do think the chaotic weapons ( Chaotic longsword/rapier)
are the best in the game.
the rapier hits faster than a whip and hits high, and the longsword has the same speed as a whip with higher strength bonus.