In general, flea pills are considered better than drops, which are topicals. Fleas reproduce quickly, so by the time you treat them, there are eggs and larvae living on your cat. Fleas can also be resistant to topicals, but some cats may have reactions to pills. There's no best flea treatment for cats because every cat is different. What works for your cat will depend on several factors, including their health, age, and side effects they've experienced in the past.