Lead generation and e-commerce are different goals, so the bid strategy should match each one. For e-commerce, marketers often use target return on ad spend, which means telling Google how much revenue you want for every amount you spend. For lead generation, the focus is usually on getting the cost per lead as low as possible, so target cost per acquisition works better there. E-commerce has a clear money value attached to each sale, which makes it easier to set those targets. Lead generation depends more on the quality of each lead. Which of these campaign types do you find harder to manage?