This is kinda like deciding between a sports car and a pickup truck. Both will get you down the road, but in different styles. Smoking using a WSM is fairly easy once you get the hang of it. Smoking with a Weber Kettle is a little more high maintenance but still plenty doable. If all you're going to use it for is smoking, the WSM makes a lot more sense. The kettle will do a broader range of jobs, though. Flip a coin?
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