I get your point about Open Source, no problem. In your intro you mentioned a series A funding and so I imagined the typical start-up which goes maybe to 50-50

I get your point about Open Source, no problem. In your intro you mentioned a series A funding and so I imagined the typical start-up which goes maybe to 50-500 employees before exit (or bust). If you are gunning to be a next RedHat or strongly driven by a Open Source strategy, I get why you would strategically invest in being a pure Open Source shop. If Linux drives your business then it is fine to go this way. Otherwise: The office stack is not a core part of your business so go with the thing that causes the least amount of friction in your company for a modest price.