Tallow is made from beef fat and is used more for frying foods (like chicken, potatoes, eggs, etc) and Lard is meant more for baking (like soft and tender pie crusts and billowy biscuits and cookies and cakes). 

Both are (or were) available online as of yesterday.  Not terribly expensive either compared to the prices of butter right now.  Either of them can be MIXED with butter to produce a buttery flavor if that's what you're going for, too. 

They are both good for you (despite what some "medical authorities" might say) but not enough people still use either of them anymore and our illness rates have risen grossly since they both fell out of favor.  We have GOT to bring them back.  I hope fast food places start using the tallow for making french fries again (it made a world of difference in the first McDonald's french fries I ever tasted back in the early 1970's and it's just too bad they ever switched over to that cheap shit soy oil, which is truly horrible for the human body. 

DO YOUR  HOMEWORK AND FIND OUT, don't just take my word for this info.