It's actually less of a gamble to target Scruff now, tbh.

If Bobby is telling the truth and Scruff's the Cynic and Bobby's the reverse Cynic, so to speak, then we should immediately win the game right after Scruff gets lynched. If the game doesn't end, that means Bobby's lying and we can get him on the next day.

If we follow Scruff's advice, we kill Bobby and he flips witch, but the game won't end yet, since there's still a Cynic to deal with. Granted, Scruff will then get lynched on the next day, so we would have no way of preventing more any more deaths after the one potentially happening tonight.

Tl;dr: if we listen to Bobby, we might win on Day 3, if we listen to Scruff, we won't win sooner than Day 4