Stork is lighter. Butter tastes better.
Since the whole point of baking a cake is eating it, surely taste is all that counts?
I always use butter. I read an article about Mary Berry extolling the virtues of stork for a Victoria sandwich so tried it - most of the cake ended up in the bin.
Stork Ingredients:
Vegetable Oils in varying proportions (70%) (Rapeseed, Palm1, Sunflower), Water, Salt (1.4%), Buttermilk (Milk), Preservative (Potassium Sorbate), Acid (Citric Acid), Emulsifier (Mono and Diglycerides of Fatty Acids), Flavourings, Vitamin A and D, 1Stork is committed to sustainable Palm Oil
Butter ingredients:
Butter (Milk), Lactic Culture (Milk), Salt,
Apart from the fact I boycott palm oil which is in Stork, I prefer natural ingredients in my food.