12-bolt and S60 are the easiest to install IIRC. I just picked up a S60 rear for the bird with a new driveshaft and it came totally assembled with fluids and such. It also comes ready to roll with LT1 backing plates so no hassle with that as well. Pricing was very solid as well compared to the others.
A lot of people like the 9inch which is just fine but even though the S60 is overkill even for my setup, I would prefer it to be bulletproof and very straightforward to install.
Good luck with your choice.
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97 T/A Ram Air Convt
Forever dyno queen / 777rwhp 662 rwtq @ 17lbs / 10.2 @ 140
'24 Corvette Z06
'17 Sierra 2500HD Dmax
'17 Lex LS460
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