Which plan should I go for? Professional or Business?

I am a Dropbox user for I think about 10 years,but I have always used only Free,because I had a powerful backup by university-provided GDrive and Onedrive licenses,which allowed me to go up to 2TB of storage. Now when my unviersity membership ended (I already graduated),I need to substitute for it.
I chose to try it with Dropbox,as it proved to have much better sync capabilities.

I was able to crash both GDrive and OneDrive by the sheer amount of changes I do,because most of my data are mass-managed by PowerShell.
I will still have to pay for Office365 Suite due to the need of the Office applications (I extensively use Excel/Word/PowerPoint/Outlook and their specific functions,which Libre/OpenOffice etc. usually dont do -or do it in a manner which is not good for me)
But Dropbox was my first onlien storage and to this point remains my major online storage.

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Richard Eltink wrote:

I believe the differents are (Standard: €12) for each user, You have to buy 3 licences,So the standard one is 12x3=36 euros.

And de Profecional plan is for 1 user only.

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DannyJPN 

Exactly as Richard Eltink states. Standard is a Business plan meant for a team of people and starts with a minimum of three users. Professional in an individual plan meant for one person.