I like to use coco oil because it's less mess, less waste and ends up being vegan/veggy friendly. Instead of following cups etc I use weight to measure my coco oil, more accurate. Butter when heated starts to seperate into milk solids and fats. You end up loosing a lot over the long run and it makes measuring your butter later much more difficult. Adding a little soy lecithin helps the absorption rate of oil. Some say you can go almost g per g with bud but I use 100g bud/shake to 1000g coco oil. About 2 bricks worth.