There is no quick answer for this, as there are several types of plaster. The “best” plaster is one that offers you the best combination of durability, safety for your household members, aesthetic appeal and cost. Gypsum plaster is the least expensive option but isn’t very sturdy. Lime plaster is non-toxic, can regulate humidity in a space, is durable and natural but takes longer to apply and can cost more; spare yourself the hassle by hiring a Tasker!