It all comes down to cost and convenience. Not to mention are you man enough to stomach the powders. I personally try to go with powders and generally mix them in my protein drinks. I can drink flax oil straight and shoot down any powder I want. But sometimes caps are just more convenient especially if traveling so I try to carry both. Other than that there is no difference.

Try swallowing the 7 oxo powder, u will change ur mind. :D