[Colgate]

delay / (1 + haste)

haste is a percentage, so for example mith 2hander is 31% haste with 40 delay, it would be

40 / (1 + 0.31) = 30.534

21/31 = 0.677
30/40 = 0.75

i don't see any situation in which the baton of faith isn't the superior choice