There are differences in battery construction and durability but they don't always translate to productivity for the trucks. If the application demand is light and there is a short life expectancy (3 year lease) you will probably never see any difference. If you want to own batteries for 5-7 years and/ or have a demanding application (temperature, floor, utilization) a cheap battery will typically give you some issues in time. Good local service can make any battery design flaws transparent. Poor local service hurts even the largest brands in some areas. Based strictly on engineering, self reported quality and consistency the best in class are Deka and C&D C line