Stacker vote for me.
You can get a cheap black kettle so you have a place to store the stacker and won't have to move it around.
I only use sand or deflectors in the 18wsm anyway so the water pan is useless to me.
You still get 2 racks to cook on.
I bought a 22wsm used it a hand full of times, it was huge to store, clean, make fire in and so on...
I bought a used redLE that came with a stacker after using it, I cleaned and sold the 22wsm and have since bought a 2nd stacker this year during one of their 10% off sales!
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