Comparing Ethereum pools involves looking at several factors. One of the most important is the pool's hash rate, which indicates the computing power of the pool. A higher hash rate increases the chances of finding a block and receiving rewards. Another factor to consider is the pool's fee structure. Some pools charge a flat fee, while others take a percentage of the mining rewards. The pool's payout policy is also important. Some pools pay out rewards as soon as they are earned, while others only pay out once a certain threshold has been reached. Lastly, the pool's reputation and community support can also be indicators of its reliability and trustworthiness.