OneDrive was the first product of this type that we started using in our company. We switched away from it because our needs changed over time.  

We did previously use Box in our company. The reason we switched from Box was not that there was any problem with the functionality. It was just a money-driven decision. If everyone has a Microsoft license and they have OneDrive included, then why are we paying extra for a different solution? Box is enough of an expenditure that it is worth removing from the budget. We were paying for every single user license to add on functionality that we already had access to. We could work with what we already had for free. Why should we pay that additional money? It makes no sense to have two storage solutions when we could use the one that Microsoft offers. Box may have had a few more features and was more stable, but it did not really justify the additional cost.  

From my personal view, the choice was made from a functionality point-of-view, but it is more like a budget point-of-view for us as a company.  

We also have experience with Dropbox.

I didn't previously use another solution. This product came as part of a package, and I've simply taken care of its capabilities.

I have used iCloud as well. However, I switched away from it because I am using a Windows operative system. OneDrive's compatibility is much better than Apple iCloud.

I used a mixture of Dropbox and Google Drive. I moved over to OneDrive because it had better storage than Google, but I still keep a hold of Google purely just for videos and pictures. At one time, I get six terabytes of OneDrive cloud storage so that's a lot more than I would get with Google.

I've used Google Drive before but just for personal use, not for corporate use.

I have used Google Drive and Dropbox and I think they are better products than OneDrive.