The answer to 'which is worse rat or' is that rats are generally considered worse pests than mice. Rats are larger, more destructive, and pose a greater risk to human health and property than mice.
Rats are known to chew through walls, electrical wires, and other materials, causing significant structural damage. They also contaminate food sources and can spread diseases like hantavirus, salmonella, and leptospirosis. Mice, while still a nuisance, are generally less destructive and pose a lower health risk.