It’s an ongoing debate, with everyone having their favourite! Peanut butter seems to be the go-to bait as it’s tasty, relatively cheap and most people have it in their pantry. It’s always a good idea to change your bait type regularly in case your resident rat likes something else. Bait lasts longer in cooler weather so it’s a good time to try meat and other more perishable baits at the moment. Also try cheese, Nutella, commercial lures, bacon, cat food etc. As long as your bait is fresh and there is plenty of it (insects and mice like bait too!), then hopefully you’ll be catching something.