In tablet mode, iPad OS. Touch being the primary operation. Basically just as we see it now.
In a pseudo desktop mode, macOS, where you get the power of a laptop in a smaller form factor. You can optionally try to use this in touch mode in a pinch but it's not necessarily designed for it.
The win would be seamless switching. Including apps... if I have photoshop open on iPad, dock, convert to Photoshop for Mac. I.e. you "dock" your iPad and it converts to a more Mac-like experience. Undock, you get the iPad experience.
To me, this would be ideal. I don't generally _need_ a laptop for personal use, so this would be a serious boon for me as I use my iPad all the time in the evening for simple consumption, but I also have a MacBook over here that gets used a few times a week, which is a costly device for how little it gets used.
