AGM batteries are more expensive than flooded lead-acid batteries, but they offer a number of advantages. AGM batteries are sealed, which means that they do not require any maintenance. They are also more resistant to vibration and shock, and they can withstand higher temperatures than flooded lead-acid batteries. AGM batteries also have a longer lifespan than flooded lead-acid batteries.
Flooded lead-acid batteries are less expensive than AGM batteries, but they require more maintenance. They must be checked regularly to ensure that the electrolyte level is correct, and they must be watered periodically. Flooded lead-acid batteries are also more susceptible to vibration and shock, and they can be damaged if they are overheated.
In general, AGM batteries are the better choice for the 2002 S500 Mercedes Benz. They are more expensive, but they offer a number of advantages over flooded lead-acid batteries.