If you really looked at what I wrote down you would have found that I said you lose more HP running through a 9" than a 60

The pinion in the 9" is set lower coming out of the axle which allows you to lower the car over the driveshaft EASIER without cutting the driveshaft tunnel.
This is done mostly with very fast cars which start getting very low.

It is my experience that the 9" is lighter if you compare stock axle to stock axle. Even with the 9" gussetted.

The 9" ring and pinion can be set in the 3rd member on a bench without removing the rear axle.

The Dana 60 requires you set it up under the car if you don't want to remove the whole axle. Which, if you don't have a lift is a bit harder.

Plus I forgot to mention what others have said. It's easy to change 9" gears if you have extra 3 members around.

All that being said I would still prefer a Dana 60 under a mopar.