Lets compare vitamin content per 100 grams of Tomatoes vs Onions:
Raw Ripe Red Tomatoes have more Vitamin A, 5.1 times more Vitamin B3, 1.9 times more Vitamin C, 27 times more Vitamin E and 19.8 times more Vitamin K than Raw Onions.
While Raw Onions contain 1.4 times more Vitamin B2, 1.4 times more Vitamin B5, 1.5 times more Vitamin B6 and 1.3 times more Vitamin B9 than Raw Ripe Red Tomatoes.
Both Raw Ripe Red Tomatoes and Raw Onions have similar amounts of Vitamin B1 per 100 g.
Both Raw Ripe Red Tomatoes as well as Raw Onions have insufficient amounts of Vitamin B12 and Vitamin D in 100 g.
Comparing minerals per 100 grams for Tomatoes vs Onions:
Raw Ripe Red Tomatoes have 1.5 times more Copper, 1.3 times more Iron and 1.6 times more Potassium than Raw Onions.
While Raw Onions contain 2.3 times more Calcium than Raw Ripe Red Tomatoes.
Both Raw Ripe Red Tomatoes and Raw Onions have similar amounts of Magnesium, Manganese, Phosphorus, Zinc and Water per 100 g.
Both Raw Ripe Red Tomatoes as well as Raw Onions have insufficient amounts of Fluoride and Selenium in 100 g.
Comparison of macro-nutrients per 100 grams:
Raw Onions contain 2.2 times more Energy, 2.4 times more Carbohydrate, 1.6 times more Sugars, 1.4 times more Fiber and 1.3 times more Protein than Raw Ripe Red Tomatoes.
Both Raw Ripe Red Tomatoes and Raw Onions have similar amounts of Fructose per 100 g.
Both Raw Ripe Red Tomatoes as well as Raw Onions have insufficient amounts of Fat, Omega 3, Omega 6, Cholesterol, Glucose and Sucrose in 100 g.