Sea and air are both irreplaceable and not interchangeable as a means of transport, there are pros and cons of both, and the types of goods and their quantities shipped through these are different.
If you are shipping some goods or other important things like documents, or sophisticated tech equipment, or anything that has a smaller weight and should be delivered in lesser time, then it is better to ship by air. While shipping via air, you will have to incur heavy costs.
If you are shipping huge loads of goods, and the goods are less perishable, then shipping via sea is a better option. The costs incurred here will be much lower.
Whether the sea is better for you or the air is completely dependent on the type, weight, and time of the delivery.