User blog comment:Krufix/Last Whisper - When to get?/@comment-76.103.140.128-20121107011321

Another concept to consider, when thinking BC vs LW, is which ADC you pick. Some of them do purely autoattack damage, while others may have some sort of poking that mainly happens before the teamfight (Cait, Ez, etc.). Your Black Cleaver is not going to help you if you're not autoattacking just yet.