I have used a number of cloud tools over a number of years. I have used Evernote, Google Drive, OneDrive, Dropbox, Asana, Trello, Kartra and more. 
Ultimately, which platform is right for you depends on exactly what you want your cloud storage to do. 

A small business owner should consider:
Who needs to access the files?
What level of security do you need?
Are you using it with a team?

Some of the platforms I have listed aren’t strictly considered to be for cloud storage. Asana and Trello are considered to be project management tools, however, they both allow you to upload and share files with certain members of a team or project which I find brings an extra level of awesomeness to cloud storage. 
Evernote is my long-term love and is essentially a way to store files across devices - so files can be accessed whether you’re on your own device - laptop, mobile, tablet. You can also log in to Evernote from a browser window from any computer anywhere, 
Google Drive is my preferred option over Dropbox. Especially based on pricing. Google Drive offers 1TB for a few dollars a month. 
Kartra is a fully integrated email service which includes membership platforms and Amazon file storage for video and file storage. 
 

If you are using Google Workspace or Microsoft 365. I am not sure why you would be considering an alternitive outside of Google Drive of OneDrive. They are included in your subscription, and integrate with the rest of your business tools.