why a Ford 9"?

i think the better question here is how many more times is this topic going to get bought up, and then beat to death. i think who ever it was that started this should have just did a search first....
I did a search, I was just trying to figure out why people choose this over something of the same brand of car it's going into. I've done the research, and the bearing sizes, spline count and so on go to the 8.75". I just haven't had to choose one or the other, but I'd most likely choose the mopar over anything else because that's what kind of car it's going into. plus, just recently am I able to drive, let alone test two comparable rear ends.

everyone took this way too seriously. like I've said, i was just wondering why people would do this. to me it's like putting a chevy 350 into another brand. It just leaves me asking why and thinking "whoever built this didn't know what they were doing.".