Though the desktop applications for either approach are essentially the same, Office 365 offers a number of key advantages that can make the difference for commercial applications like small and medium-sized businesses and enterprises.
Web Applications – The Office 365 web applications are useful for a number of reasons. Some users simply prefer the interface. But one of the most common use cases is to enable continued work on the go from any device. A worker could sign in to their Office 365 account on a hotel computer, for example, and continue working where they otherwise wouldn’t have access.
Updates and Security – Microsoft is always pushing updates out to Office 365 subscribers. These updates can include new features, bug fixes, or security patches.
Multiple Devices – Office 365 allows businesses and individual users to install Office applications on all of their devices, including their phones and tablets. This allows basic editing and writing features, including email, to get done wherever your employees may be.
Extra Storage – Office 365 subscriptions include various options for extra cloud-based storage through Microsoft’s OneDrive platform.
Tech Support – Subscriptions include technical support directly from Microsoft. Office 2019 does not. For basic use, this may not be a problem, but businesses may want the extra support.
The question of Microsoft Office 2019 vs. 365 comes down, in the end, to scalability. Businesses are growing or downsizing all the time, and Office 365 offers the agility to scale without being burdened by technology.