Only had the Vision Kamado for a few days and have not smoked on it, but from what I have heard it is as easy as it is on a WSM.
The key will be what you are after. Vision can smoke and grill well, but is limited by size as a smoker. WSM has plenty of space and smokes very well, but grilling is such a hassle I wouldn't consider it as an option.
I have both + a Weber Performer so I have all my bases covered.