Box

Very easy to integrate with email client to send large files and to otherwise share files.

No data if the files are encrypted or not.

It's easy to understand if you've used Dropbox before.

I am a Macbook user and since I started using Box I have had consistent problems with files not synching. I don't mean temporary delays, I mean NEVER synching at all. This affects my ability to work with my colleagues. Despite first line Box support saying they would refer the problem to a product expert, there has been NO response for 4 weeks despite frequent reminders. Box's stated approach to customer support is to attach no priority whatsoever to problems that only affect one user. That certainly reflects their attitude to me. There has been no attempt whatsoever to investigate why this problem is occurring or how it might be resolved. This is very disappointing.

What I liked the most when using box was its security, in addition to its integration with MS Office, which makes it an alternative to Onedrive. I also like that from the Business plan the storage is unlimited.

Like any cloud storage service, its main disadvantage is the price, although for a medium or large company this does not mean an expense, for a small company that is just starting out, paying a monthly fee can be a considerable expense.
The little free storage also means that better options are found for someone who is just starting out, of course leaving security aside.