Thanks! I found this embedded in the same thread:
https://ggweather.com/enso/ca_elnino.htm
Per SF data, the last Strong La Nina, 2010-2011, had more rainfall (28.87") than the last Strong El Nino, 2015-2016. (23.26")
Maybe this new metric can help improve our forecasts during both El Nino and La Nina winters?