Cost, certainly, is not better with Office 365. And LibreOffice has versions for Linux. It's also much easier to drag and drop cells in Calc than Excel (small advantage, but with my eyes, Excel is tricky) Excel has far fewer file types it can handle (ClarisWorks, QuarkXPress anyone? Export as EPUB, and so on.) LibreOffice has a much better configurable spellchecker, six different ribbon-like interfaces, can exports bits of your spreadsheet as a JPEG file, and is free. And cost. Did I mention that? Why rent something that can be got for free?

(OK, if all you get is MS file formats, than O365 is fine, if expensive. I've been using LO for years at work in a MS shop, and had no issues for a couple of years.)