I have a 26" Kettle and the 22.5" WSM. Both are overkill for my day to day use. I usually cook for 2 adults and a toddler and I've been using my 14" Smokey Joe the most. I love that it sips on fuel compared to my bigger cookers. I suppose it winds down to what you'll be cooking and how often. I cook ribs and brisket and don't mind splitting a brisket to fit it in a cooker if I need to. Some people like cooking a piece of meat whole but I don't mind doing what needs to be done to work with what I have. I bought my cookers with the mindset that everything had to be whole, I don't feel the same anymore. I don't feel like I made a mistake but I can do most of what I cook on my Smokey Joe. I can cook a full rack of ribs, a brisket flat or some pulled pork. You might have to cut pieces to fit in the cooker but it can be done.
Now if I was you, given you already have a kettle I'd buy the smokey mountain. It's nice to have a cooker that's really smoking centric and a cooker that's grilling centric and this way you'll have both.
Also, Smokenator makes a "Hover Grate" that's 18". I bought this for my Master Touch and it added a lot of space.
https://www.smokenator.com/product/smokenator-hovergrill-add-cooking-space-to-your-grill/There's also the "Kettle Zone". It'll let you use the entire 22.5" grate for indirect cooking. If you were to buy this along with the Hover Grate you'd almost have as much cooking space as a 22.5" Smokey Mountain minus the vertical space.
https://auraoutdoorproducts.com/products/kettle-zoneBoth of these accessories total out at $140 so this isn't a bad option either.
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