Granny Smith's are common here & I really like them. My preferred species is the Australian developed Pink Lady, which doesn't fruit up here. I put in an Anna, which I had never heard of before. I also have a mature native Apple on the property, but sad experience tells me they are disgusting & pretty much inedible!yes indeed, but they are very variable in their phytonutrient values, and all of them are a lot poorer than wild varieties of apples. Worse, although thousands of varieties exist, a mere handful dominate the supermarket shelves - how many appear where you usually shop?
Fwiw, the most nutritious among the 12 most common varieties are Discovery, Fuji, Granny Smith, Liberty, and the Bramley cooking apple (which has 3 times more than the Fuji, which has more than most other common varieties).
Robinson, Eating on the wild side, 2013 chapter 10.