What do you do when the tender bits get rubbed raw by wet bike shorts during a long ride? You are on a multiday ride and taking a day off isn't a good solution.
They are both udder cremes and they have worked for years helping to heal chapped and raw cow udders. But they are also very different. Udderly Smooth is a clean white lanolin creme that won't stain your clothes. Bag Balm is a foul looking and smelling, nasty orange/yellow grease that looks like something a mechanic would use.
A friends from Georgia tells me that introducing him to Udderly Smooth at the local drug store saved his tour and works great.
Personally, I don't find it strong enough. When I get rubbed, I am really rubbed. I use the "High Test" of udder cremes Bag Balm.