Schlage is definitively the best deadbolt among the three, offering superior ANSI Grade 1 durability, heavy-gauge steel construction, and exceptional pick-resistance. Kwikset ranks second, providing an excellent balance of affordable pricing, user-friendly SmartKey re-keying, and reliable smart features for everyday residential use. Defiant ranks last, serving as an ultra-budget entry-level brand sold primarily at home improvement stores that offers basic security but lacks the heavy-duty build quality and longevity of Schlage and Kwikset.
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