I believe the stock is slightly different. I own one deck of the ones T11 sells and about a dozen store-bought decks. There is a slight difference on the boxes, and I believe the store-bought "feel" more like standard Bikes.
I'm not really interested in having the kind of deck that springs, snaps, and maneuvers to help facilitate my actions. Bikes work just fine for me, so the store-bought Guardians also work fine. Yet, I do enjoy that one "pure" deck, as it were, as a nice show-off deck.
The ones at your store are still good Bicycle quality and excellent working decks. They are certainly a lot less expensive than buying & shipping the T11 decks online. So, I would say to at least try them out if you are genuinely interested.