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The BB card is generally easier to get approved for compared to other extended 0% cards, such as Simplicity / Slate, so that might be a reason why he's going for the BB card. Like others mentioned, there's also some discounts and promos as well.
From a rewards standpoint, 5-6% discount for using a BB card is nice too, especially now that the $2000 cap has been implemented for the Cash+
i have bb mastercard gold..im stuck with 300 cl i tried to increase the cli but they denied it.. i think they want a year before you request to increase the cl..