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, 4 speed, Dana 60
'71 Demon 340, no drivetrain, on blocks behind the barn
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax