I like to use the latter (available from natural food stores) as they are the least processed of the three, and give the best results flavor - and texture-wise. (cnz.to)
The next morning, or the one after, or the one after the one after that, your rolled oats and chia seeds will have absorbed all kinds of moisture and flavor from the milk and Greek yogurt and fruit juices and will have turned all plump and deliciously creamy as a result (thehealthyfoodie.com)
This only takes a few minutes, and the resulting flavor is 100 % worth it! (urbanblisslife.com)