Grapefruit sodas vary considerably from brand to brand. Some use real fruit juice in their recipe, which gives a more authentic taste, while others use grapefruit extract, which can result in a more synthetic and flat taste experience.
Another important consideration is the sugar content, which can also vary considerably. Some grapefruit sodas are oversweetened, which can make them less suitable for use in drinks and cocktails where the balance between sweetness and acidity is critical.
When choosing grapefruit soda for your drinks, it is therefore important to consider both the flavor profile and the sugar content to achieve the best taste experience and balance in your creations.