Rocky...as a cabinet installer I carry grk #8 1", 1 1/4", 1 1/2", 1 3/4", 2" & 2 1/2. I use 2 1/2" truss head/cabinet screw for hanging my cabinets. I've never had a cabinet fall due to my screws...I've seen people overload a cabinet & the backer is still on the wall!
For box assembly when the sides are not visible or if they're getting covered I use dominos and 1 1/2" screws...screwing from the outside of the box!
Hope this helps!
Bob