Microsoft has really set about overhauling the entire Office 365 suite in recent years. Modern tools to increase productivity are already available to you online.
The integration of Microsoft PowerApps, Microsoft Flow, Azure functions and others in SharePoint Online provides entirely new options to use SharePoint content and processes.
But the relevant questions for you are as follows: how do my employees want to work? How do they work today, and what do they expect of a modern platform? If you are already faced with the requirements of mobile access or even mobile collaboration, I believe that you will find no alternative to the use of Office 365, i.e. SharePoint Online.
Of course you can also work with a hybrid option, and likely it will be attractive to some of you. After all, you can keep your files in the datacenter while still enjoying the benefits of SharePoint Online. For more information on this subject, take a look at the blog article Hybrid scenarios with SharePoint 2016 .