The only difference between collagen pills and a collagen powder product is the mode of delivery. While some collagen peptides and supplement product pills come mainly in the form of hard tablets that can be swallowed/chewed independently, powdered peptides have to be mixed with another solvent, say water, juice or tea to make it more palatable. That said, capsules are a far better choice since it is easier to keep track of your usage/dosage within a given timeframe compared to when you are using powders which rely on arbitrary measurements.