12 bolt w/33 splines or 9in rearend with g-link

[BMR Tech]

An aluminum centered 9" is lighter overall, allows much easier gear and posi swaps, and doesn't rely on C-clips to retain the axles. The ring gear is slightly larger, pinion bearings are larger, and you just have more options for internals. I am a die hard Chevy fan but I would use a 9" over a 12 bolt everytime if I was starting without anything...