Decide the goal: thick dollop/spoonable (scones & toppings) vs smooth spread (cakes & fillings).
Pick the closest match from the list above, using the given ratio as your starting point.
Adjust consistency: strain thickening-prone swaps (yogurt/sour cream/ricotta) or loosen cream cheese with a small splash of milk.
Taste-adjust for recipes: add a pinch of salt if your swap tastes flat, or balance tanginess with a tiny amount of sugar for desserts.
Use immediately for best texture; if chilling, stir again right before serving to restore a creamy body.