Whatever bread you have handy is the best bread for bread pudding muffins, as long as you have an abundance of it. We use white bread in this Bread Pudding Muffin recipe, and it works perfectly well. You could use a brioche loaf, a loaf of Challah bread, French bread ... pretty much any sort of bread. I wouldn't suggest using rolls, like Kaiser rolls or seeded dinner rolls. But any other bread should work.