The answer to 'which is worse spider or' is that spiders are generally less harmful to humans than cockroaches. Spiders are typically not aggressive towards people and their bites, while painful, are rarely life-threatening. Cockroaches, on the other hand, can spread a wide range of diseases and their presence in the home can be an indicator of unsanitary conditions.
Cockroaches can contaminate food, trigger allergies and asthma, and even carry bacteria like salmonella. They are also difficult to get rid of once they infest a home. Spiders, while creepy to some, are generally harmless and can even help control other pests in your home.