mostly a toss up. cheaper one's pros = 4 USB 2.0s vs. 2, has an external 3.5", is fully made of steel. expensive one's pros = has 2 2.5" external slots, 2 more expansion slots (though 7 to 9 is already the range of 'you do not need any more').
the more expensive one is prob a bit better on cooling but doubt it's really notable. cheaper one has two bigger fans (230mm vs 200) but the more expensive one has an air duct for the GPU. cheaper one's set for liquid cooling already though, so if that's the route you're going then that one wins that angle.
more expensive one seems overall better, but it's really like trying to argue which girl is hotter between a 9 and a 9.5: both are fantastic, have certain perks the other doesn't, but one's just a bit better overall. personally wouldn't consider the differences worth $40, but eh.
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The King Wang.
Listen up Urinal Cake. I already have something that tells me if I'm too drunk when I pee on it: My friends. - Colbert.