This is a tough one, and the answer is: it depends. While all are delicious, in the North Florida, South Georgia area, Elliot and Stuart pecans are the two most popular varieties. Many folks say Elliots are the best with their sweet taste and high oil content, but Stuarts come in a close second and are more commonly available. It may be different where you live.  I used Elliots in this recipe, but most of the time, when you purchase pecans from the grocery store, it doesn't say what variety they are on the bag. The most important thing is to ensure they are fresh and buy this year's crop when buying pecans. Also, inspect the nuts to make sure they are plump and light or golden brown. If the nuts are dark, they are probably old.