Half and half is made from equal parts heavy cream and milk.  Creamer doesn’t rely on a milk or cream base, so the ingredients, quality, taste and texture of creamers vary.  One could argue half and half is better because it is just milk. So if you’re not a non-dairy person, half and half is the least processed option with the least amount of sugar or additives.  If you tend to shy away from high fat and dairy in general, then choosing a type of creamer that suits your taste preferences is the better option.