For the average guy with a heavy street/drag car the dana 60 is the best choice by far. A strange 60 or a 90s van light housing is only a 40-50# weight increase, in the right place, and you most likelywill not have to work on it. Gear swaps are simple with a set of slip bearings or just set up 2 gearsets when you build the dana, that is still cheaper than a comparable strength 9", and a spare pumpkin. Once you go real fast the 9" wins mainly because you can get a stronger housing either aftermarket or backbraced.