GM used either a 10 bolt (~1980-1991) or a D44 (up to 1980 or so) in their solid axle 4WD trucks. There aren't many differences between the two and they are both very similar in strength.
As for the difference between a 1/2 ton (6 lug) or 3/4 ton (8 lug) 10 bolt/D44, there really isn't any except for the lug pattern.
There is no strength upgrade between a 1/2 ton and 3/4 ton front end.
Both have an 8.5" ring gear, BTW.