I choose 9"
I choose 9" because parts are easier to find (when in need), more race cars use them so more development on things occur for them meaning more options in the future, more options on brakes, rotors, axles, etc, and most of the parts for them do cost less in the end.
Sure there are a few companies that specialize in GM rear parts that are as good or maybe even better than the Ford 9", but they are just that - specialized parts.
Coming from a racing background, I know I would much rather have parts available from the local parts truck, or a good probability someone else there has spare parts that will work. That's just how I think.
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