Get one of those TA covers with the cap supports in it for the 60. They are somewhat expensive new but used ones ain't bad...
Ain't much difference but when ounces count, so does every bit of power robbers.
Can't drive em in town like you do a reg diff but once you learn a couple of tricks, it really isn't a big deal.
Many think that a 9 is much stronger than the 8 3/4.....well, although it is stronger, it isn't that much. Imo, they do not hold a candle to the 9 3/4 (60). Lots of people like the drop out but for those that set up their own gears, you can swap gears in a Dana fairly quickly too if you save the shim package and keep them with the gear set you just removed. That way if you want to go back to them later, it's fairly easy and quick.