Objective: What are the ingredients for a chicken confit?

Which of the following solutions is more sound in terms of naive physics reasoning?

Options:
-- 6 to 8 skin on, bone-in chicken thighs, 2 tablespoons kosher salt, 1 teaspoon freshly ground black pepper, 3 or 4 fresh thyme sprigs, 2 bay leaves, 3 or 4 garlic cloves, peeled and smashed with a knife, 1/2 yellow onion, thinly sliced, 2 cups extra-virgin olive oil (or enough to cover chicken) and, 2 cups canola oil (or enough to cover the chicken).;
-- 6 to 8 skin on, bone-in chicken thighs, 2 tablespoons kosher sugar, 1 teaspoon freshly ground black pepper, 3 or 4 fresh thyme sprigs, 2 bay leaves, 3 or 4 garlic cloves, peeled and smashed with a knife, 1/2 yellow onion, thinly sliced, 2 cups extra-virgin olive oil (or enough to cover chicken) and, 2 cups canola oil (or enough to cover the chicken).;
6 to 8 skin on, bone-in chicken thighs, 2 tablespoons kosher salt, 1 teaspoon freshly ground black pepper, 3 or 4 fresh thyme sprigs, 2 bay leaves, 3 or 4 garlic cloves, peeled and smashed with a knife, 1/2 yellow onion, thinly sliced, 2 cups extra-virgin olive oil (or enough to cover chicken) and, 2 cups canola oil (or enough to cover the chicken).