What is Better - Ashwagandha Capsules or Powder?

While consuming Ayurvedic medicines, sometimes it becomes very confusing in what form a particular herb can be consumed to get the best benefit out of it. For example, one might think which company makes the best Ashwagandha Capsules in India! This happens because almost every herb is available in multiple forms, i.e., Ashwagandha tablets, capsules, powders and even decoctions.