When it comes to these three cloud-computing solutions, it’s not really a question of what’s best. It’s more about which one best suits your business’s needs and goals. SaaS for ecommerce is an excellent choice for online merchants and new businesses because it requires very little management from the user; but, in other industries or big companies with big budgets, IaaS offers a lot more flexibility. You have to decide for yourself what's most suitable in your current circumstances.