Does anyone have recommendations for an Enterprise Content Management (ECM) solution?

We use Microsoft software through its cloud platform. It's easy deployment, support and ongoing maintenance. 

Microsoft Tools work OK (Sharepoint and Teams), we also use Confluence, have put together a bit with Google tools and are investigating ServiceNow. Unfortunately, I’ve not found a platform that *I* am happy with. Different team members have different preferences. Some love what they use, some hate what they are forced to use. There’s no single platform that everyone loves.

Microsoft 365 platform again very popular for its ease of deployment and ease of use in many environments. Depending on your industry, employee turnover and training versus the commonalities and skills most end users have already acquired. makes it easy to push in the 365 direction also. 

1. Keep Track of All Your Information. 2. While having a large quantity of critical information may be necessary and desirable, it can often lead to problems 3. Reduce Operating Costs 4. Save Time. 5. Improve Customer Service. 6. Minimize Risk. 7. Document Version Control.
System provides a unified platform for the dissemination, storage, and management of data. 

I would recommend Microsoft 365 as it comes with tools for communication, storage, and collaboration.