Neither serum is universally better as they serve different, complementary roles. Vitamin C (L-ascorbic acid) is ideal for brightening skin, fading dark spots, and boosting collagen. It is best used in the morning to protect against daily environmental damage. Vitamin E (tocopherol) is a rich moisturiser that strengthens the skin barrier, heals dry patches, and calms inflammation. If your goal is anti-ageing and brightening, choose Vitamin C. If you need deep hydration and healing, choose Vitamin E. For the best results, look for a product that combines both, as Vitamin E actually boosts the stability and effectiveness of Vitamin C.