What are the differences between a 4 prong and a 3 prong dryer plug, and which one is more suitable for modern electrical systems?

The main difference between a 4 prong and a 3 prong dryer plug is the presence of a ground wire in the 4 prong plug, which provides better safety by grounding the appliance. The 4 prong plug is more suitable for modern electrical systems as it meets current safety standards and reduces the risk of electrical hazards.