Spirulina and matcha are the two most common green powders on the market, and they are used by many people on a daily basis. When it comes to choosing between spirulina and matcha, the first thing you should consider is your goal. If you’re looking for a plant-based source of protein, then spirulina is your best bet. It also offers many other nutrients like B vitamins and vitamin K that are important for good health. When choosing between those two, spirulina is the best from the nutrition point of view.