Cut-throat's point is worth thinking about, and FIREcalc also tends to support the delayed benefit (higher overall SWR), at least in cases where that benefit constitutes a large fraction of required cash flow.

Another thing to consider is this: if a wife is younger and collects on her husband's record, you can lock in a higher benefit for her in the relatively likely event that she outlives the husband. (If you delay past full retirement age though you have to keep in mind the maximum family benefit...)