The answer to 'which is worse flea or' is that fleas are generally considered worse than other common household pests like ants or spiders. Fleas are resilient, reproduce rapidly, and can be difficult to fully eliminate once they infest a home. They can also transmit diseases and cause skin irritation in both humans and pets.
Fleas have a complex life cycle that makes them challenging to control. They lay eggs that hatch into larvae, which then develop into pupae before emerging as adult fleas. This cycle can continue indefinitely, with adult fleas feeding on their hosts and laying more eggs. In contrast, other pests like ants or spiders are generally less persistent and easier to remove from a home.