It's all a balance. SCHRS will address newer designs (those without adequate race results to calculate a meaningful DPN number), but requires measuring, which either means advance planning by the sailors (get your cert before the season/regatta), or the OA needs to have measurers and time factored into the event schedule.

If using a "stock" number, both systems rely upon the boats using the exact setup used to develop the "stock" number. The problem with using a SCHRS number generated in Europe is that the sail plan, boards, etc. may have been different on the boat used to calculate the number (than is sold/sailed in the US).

The challenge of either system is garbage-in, garbage-out when it comes to SMOD sails. We're at the mercy of what the manufacturers are willing to give us for data.

Mike