For myself, I prefer MS-Office that is Office 2013 or earlier simply for the reason that the entire suite is composed of programs resident on your computer and that you have a permanent lease on (no one owns Office besides Microsoft, technically - you're granted a license to use it).
Unless there's some element of Office 365 or Office 2016 that you simply must have I'd look for a reasonably priced copy of Office 2010 or Office 2013. That being said, be certain that the edition you're looking at contains PowerPoint. There are so may editions of Office that my head boggles at the combinations of programs in the Office family that get bundled together under different editions.
Brian AKA Bri the Tech Guy (website in my user profile) - Windows 10 Home, 64-Bit, Version 1809, Build 17763
Presenting the willfully ignorant with facts is the very definition of casting pearls before swine.
~ Brian Vogel