You’re comparing an environment (enterprise) to technology (web), so in a strictly logical sense, no answer is possible. However, I think I know what you mean, so I’ll try anyway.

Enterprise development is hard. An enterprise is by definition large (and has often been around for many years), so enterprise software will typically involve many integrations. If you’re lucky, they will have an Enterprise Service Bus or similar integration platform, but in all likelihood, you will face the need to integrate with several legacy systems through a variety of interfaces. This causes each enterprise application development effort to be complex, unique and risky. A prudent enterprise will implement strict quality control procedures to manage this risk, which the average programmer will consider to be unnecessary overhead.

Web development is generally easier. You need to build an application with a browser-based interface, but this has been done before and you have many different frameworks available to help you.