Will say that I personally have a Surface Book 2, a Surface Pro 5, and occasionally use a Surface Pro 2 at work. On both the Pro's, despite it technically being easier to flip them to full tablet (just yank off the mag keyboard), I find that the slightly larger and heavier Surface Book feels more comfortable for doing 'walk-around' tablet mode. Sitting down with the Surface Book 2 on a table I will literally switch between the keyboard, touchscreen, and the wireless mouse I have connected to it on the fly, different actions feel more natural between each.