CBD capsules have to go through the stomach and the liver before they are absorbed. CBD oil is ingested sublingually, so it is absorbed much faster and goes directly through the bloodstream. The oil works faster than the Cbd capsules, since the capsules have to be digested first. CBD comes in flavors, and is not pre-measured. Capsules have no flavor and are pre-measured. Some people find the flavors of the CBD oil quite unpleasant because the taste of the oil cannot be completely covered up. So their best choice is the capsules.
The biggest plus about the oil is the faster bioavailability. Since the capsules have to be digested, some of it might not get absorbed. The oil get absorbed instantly under the tongue. One is not better than the other, they are just different. With the oil, it kicks in 15-30 minutes, while the capsules take 30-90 minutes. The effects of the oil last 4-6 hours, while the effects of the capsules last 8-10 hours. The liver slowly releases into the bloodstream the medicine from the capsule, which is why that lasts longer.
The oil comes in a 30 ml bottle with a dropper, and the dropper is used to put oil under the tongue. It's not very convenient when you are out in public. The good news is that you don't need that much. A little goes a long way. The capsules are easier to take in public, no one questions a capsule. Another advantage is you don't get the unpleasant taste.