Hi. Yes I am maybe looking for a degree of precision that does not exists.
Between the different models that offers the different tools (windy, Windfinder) the difference seems to be more at the gust level. For instance, for this week-end, max gust can go between 12 and 20 depending of the option chosen. Not a big deal I would guess for bigger
boats but obviously more impacting for smaller
boats.
I usually look for the extreme one to avoid bad surprise.