To help you find the most cost-effective solution for you, I'm going to split the subscriptions into five categories.

Let me help you break those down so you know which subscription to buy. They're basically just Office 365 except Office 365 still exists as well! There are now about 20 different plans before you consider government, nonprofit, or individual services. Some of the Microsoft 365 plans include those additional services, and others don't. Now that would be fine, except Microsoft 365 already existed and was well understood to mean 'Office 365 plus additional services'. Microsoft's cloud subscriptions were confusing enough but then they decided to rename some of their Office 365 plans to Microsoft 365. Microsoft 365 & Office 365 Plans Compared JMicrosoft 365 & Office 365 Plans Compared