Tiny Garnet sweet potatoes are much, much yummier than big ol’ Beauregard sweet potatoes.
Also, re. the “yam” vs. “sweet potato” question: This has bothered me for ages, and this is a summary of my informal research:
YAMS (from Wolof “nyam” meaning “to taste”) are a food plant grown across Africa, Latin America, Asia, and Oceania. The tubers involved are often ginormous, and they have oxalic acid (an irritant) in their skins. They don’t look anything like sweet potatoes to me, except for the general shape and starchiness.
SWEET POTATOES are a food plant grown across Africa, Latin America, the Caribbean, North America, Asia, and parts of Oceania. Some varieties (mostly the very-orange ones) are colloquially called “yams” in the U.S. and Canada; speculation is that this is a linguistic transfer from kidnapped Africans who stuck the word “nyam” on the closest parallel big starchy tuber widely grown in the American South.
So, it’s not wrong to call a sweet potato a yam; it just might get you the wrong thing if you’re in an international market.