re: What email providers are you using for your small business?

Roughly speaking web host provided email is going to provide you with unlimited email addresses and aliases. It won't have company wide calendars and contact lists. It wont have instantaneous new mail notification. There will be a company wide space limitation.

Office 365 and Google Workspaces charge per user. They have compnay wide calendars and contact lists. They have instantaneous new mail notifications. There will be a per user space limitation. You have access to web based office suite. Office 365 has additional tiers that give you access to desktop applications.