To be honest, I built a Dana 60 for my car back when it was a stickshift and I kept breaking 8-3/4 parts. I chose the Dana because I felt I could build it for cheap, and because I knew they came with pretty beefy factory posi units which I wanted to keep for a street car.
Thinking back though now that my car has become more "race oriented", a 9" seems like the way to go...Dropout third member, spool, good axles, and ring and pinion and your set...backbrace if you want to. Sometimes it just makes sense to use what is popular because, well, it is usually popular for a reason
That said, why the heck are people arguing about what was put in trucks for strength? Trucks don't care about weight when building for HD, but race cars do! With that logic, we should all have the corporate GM 14 bolts in our race cars
