This is a myopic take.
I've found iPads to be fantastic presentation tools.
Having an ipad on a conference/convention booth is amazing - airplay my rotating content to a big screen, and when someone walks up I can grab the ipad to delve into details based on the conversation.
Early on (first gen ipad) I had a whole client team nickname me "the ipad guy" because I showed up and presented across a few ipad apps where I could pinch, zoom, and annotate live instead of showing a vanilla PPT file.
Which apps do you use for this? Keynote or something else?
Fully disagree. iPadOS is too unstable, janky, immature, and prone to awkward half-baked changes to be used as a regular computer. I've tried for years. OP is correct - stay far away from iPadOS for computing. Use macOS.
This might be the only use case in which a Windows tablet is a good option. I've seen some people using Windows tablets with a pen for presentations quite efficiently.
Windows has the benefit that it's still an open-ish OS. If something doesn't work as expected, it can be somehow hacked into the way you need it to be. I think Linux doesn't work well with touch devices and pen input, also the choice of presentation software is much more limited.