Need everyone's oppinion

If you are starting from absolute scratch, do the Dana. You'll spend roughly the same on either. I build my Dana's from scratch for right at $1000 sans brakes.

If you are frugal and shop right, it's easy to do.

If you already have the 8.75 and some of the main pieces, then do that one.

On the HP use. Never noticed a difference in ET from one rear to the other. Some guys did test of cars swapping out some popular rears and the et's were basically the same.

IIRC, A Dana 60 with the same components, spool/gears as a similarly outfitted 8.75, weighs about 33-35 pounds more, it may have been 45. It's not anywhere near 100 pounds.