You can spin the Mopar part bs to no end. The 9" rears I see have no Ford parts. If you choose to run a torqueflite or 833 for the same reason you would probable want to run a dana.

If you are building a serious et car choose a 9. Unless you desire less drag and a higher pinion.

The guys who usually ask the question as to what they should run actually should choose the Dana 60. 9-11 second full body cars with a well prepped Dana will never hurt it. Some rare cases where the guy wants to slam the car on the ground with big wheels and tires should choose the 9 to keep the driveshaft out of the tunnel.

Call it a pet peeve just get tired of the everybody should run a 9" just because someone else said so.