I'm inclined to take the 29 decks quoted in Nemesis at face value, there's no dialogue to the contrary within that film and we're far enough removed from First Contact that the ship could conceivably have had some sort of refit that increased the deck count (indeed, it had certainly had a mild visual overhaul at the very least).
As for the 24/26 decks quoted in FC, either Picard misspoke, Lt. NotWorf misspoke, the Borg built two new decks or two decks were classified - hence Picard telling Lily, a civilian, there were 24, and the security chief giving the actual number of 26 on the bridge.
As for the 24/26 decks quoted in FC, either Picard misspoke, Lt. NotWorf misspoke, the Borg built two new decks or two decks were classified - hence Picard telling Lily, a civilian, there were 24, and the security chief giving the actual number of 26 on the bridge.
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