The fact that it is cloud-based and therefore requires an Internet connection means it is the opposite of "portable" for me. When I go to client meetings and have to deliver a presentation, I can't assume I will be connected to the Internet. That's why I use PowerPoint.
I really like using Google Slides, and whenever I had a presentation, I would just download in all different formats for PowerPoint, so that I cover the compatibility issues, but I have encountered that the PowerPoint export didn't look the same as the Google Slides one, so I highly recommend check the files before leaving your PC!
Isn't that really a problem with PowerPoint as well? If you e.g. use a font that isn't available on the computer you use to present. PDF export solves this, typically.
The benefit of an exe is you can simply keep it on a USB incase it needs installing elsewhere. Also you know for sure it's offline and isn't fickle to a browser history clear out.
