If the 9" has a stock centersection, then the Dana is stronger.
If the 9" has a good aftermarket centersection and pinion support, then it's the better choice.

I can't comment on the differential, b/c everything I have uses spools.

CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax