One thing not mentioned here yet is that the pinion or yoke location is "lower" on a 9" than that of a 12bolt. This helps when building a "low" ride height car because you wont have to modify the trans tunnel as much on a 9" than you would on say a 12 bolt. It "hangs" low instead of being located in the center of the ring gear as on a 12 bolt.
I prefer the old skool 12 bolt with 35 spline axles, big ford ends and a girdle cover. But have used both.
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