I voted McDonalds, as their biscuits most remind me of my Grandmothers. (McDs mix uses buttermilk "flavoring" & hydrogenated Beef Fat)
My Grandmother made "cathead" biscuits, used real lard and real "from the farm" Buttermilk, the best biscuits ever!
I can make a pretty good Buttermilk biscuit myself, but my reluctance to use 100% lard (store-bought lard has an "off" flavor) and the lack of availability of "real" Buttermilk makes it hard for me to make the perfect biscuit, but I always get complimented on my biscuits nonetheless.