The only difference that I can see be the length ie., Walmart is 7' 11" and the other is an 8 footer. Lotta' times stores/sellers wil go to the highest denominator and in this case it's only an inch (length of vessel). Both have motor mounts (bow & stern) and swivel seats. Basically all the other features are the same with maybe some small infractions butttt, we cannot forget that price difference, can we

!? There be a' lot of these type vessels on the market but, if you've set your mind on choosin' between the two then I'd go with the "Wally World" one and save the xtra buck$...

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Note: Specifications on Joe's doesn't say what the beam width is, however "Wally World's" it's 49" and by just lookin' at them their pretty much the same. To reiterate ~ Walmart one

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Added: Did some checkin' and both the vessel's your lookin' at are the same (Pelican "Bass Raider" Pontoon Boat) ~ here be a' MUCH better price...
http://www.academy.com/index.php?page=content&target=products/outdoors/marine/boats&start=6&selectedSKU=0142-02305-0010