The one from Walmart is lighter, but it's also smaller. I think I may be responsible for writing about the shipping weights. The confusion comes from marketing specs, which lists the largest Walmart version as the same size as the 24 inch version, but the Walmart version includes the legs in the dimensions where I believe the Bass pro version only includes cooking dimensions. Obtaining usefull and accurate information on these things are way too dificult and I would have said forget it a long time ago if I didn't want a smoker so badly.
The 16 inch is 55 pounds
The 20 inch (Walmart version) is 65 pounds
And I believe the 24 inch (Bass Pro version) is 75 pounds
Judging by the weight, I now believe the construction quality of all of them are similar.
Also of note is the pictures on the box of the 20 inch from Walmart now shows the grease tray (though it's not shown in the online version).