Okay, so first, Seeker, you say you don't like the taste of suet and prefer the taste of pork fat (post #1 of this thread). Next post comes the trick question, false dichotomy, or whatever you want to call it: Which would you choose, pork or butter fat? Then you say you can only rarely get suet! From the original post, it doesn't seem like you even want to eat that, which is, of course, fine, it's your life.
For the life of me, I cannot imagine that the 2 sole sources of animal fats are crappy feed lot pork fat or organic heat-treated butter. Beef bone marrow can be found from any butcher in any US state, and would be far superior to those other 2 choices. Marrow is beautiful, nerve sooting, satisfying fat, and I believe the creamier variety comes from the shank (Tyler would know more on this). Even grain-fed beef marrow would be superior in nutrients to extra-muscular pork fat. So it appears, on the face anyway, that you would like justification from the group for this personal choice. But then again, I could be wrong and intend to offer nothing but constructive ideas.
Donrad offers some good info on pigs. And really, the reason so many parasite and pig diseases can be transmitted to humans is because we are genetically similar to them. I can get pasture raised pork products from a very reputable source, but still I should not consume it often. Beef, sheep and bison are really the best land animal fats and proteins for health.
Tyler offers good info on dairy. He stands firm on dairy and is such an inspiration to someone like me who lapses on occasion to the addictive opioids in dairy. Casein and lactose are in butter. You can melt butter for 30 minutes on low and you will be left with the glue-like milk compounds on the bottom. Ghee will have less, but it is heated even more than the pasteurized butter, and no maker of ghee guarantees casein, lactose free ghee last I checked.
I hope you can find a different option than those 2 choices.