Now that I've rendered both beef and hog here's a comparison.
Hog fatback - more smelly to render and higher chance of smelly fat. The rendered fat is very soft, barely solid at room temp but extremely white. Looks like its been commercially bleached. Apparently dry rendering it in a crokpot will result in an odourless fat. Takes longer to render than beef and cutting fatback into chunks isnt much fun ( need a sharp knife) the fat tends to melt on skin contact and is quite creepy to handle. Least favourite thing to do. Rendering yield about 60% of dry weight.
Beef kidney leaf - much nicer to handle basically because its very dry, flaky stuff a bit like beeswax. Chopping it up is a breeze you just shave it into chunks with a knife and it basically crumbles. Although it looks horrible ( like an internal organ) the feel of touching it isn't half as icky as pork fat. Rendered its an ivory cream colour with very low residual scent and much harder than lard at room temp. Rendering yield 90% of dry weight.