With the introduction of THC concentrates, there are different concentration levels you can buy. Shatter is the heavy hitter. If you want a very strong potent high this is the one for you. It's processed twice which leads to increases in the THC percentage. Butter will give you more of a flavor than shatter, but less potent. Lastly oil will give you the most rich and flavorful hits, but THC levels are about 60% compared to 80-95% in shatter. Its all about preference.