Search retargeting is a form of retargeting that uses search engine data to target ads. Site retargeting, on the other hand, targets ads based on web browsing data.
The main difference between the two is the type of data that is used to target ads. Search retargeting uses search engine data, while site retargeting uses web browsing data.
Search retargeting is more effective than site retargeting because it is more specific. Site retargeting is less effective because it relies on cookies, which can be deleted by users.
Search retargeting is also more expensive than site retargeting. This is because search engine data is more valuable than web browsing data.
Overall, search retargeting is a more effective and expensive form of retargeting than site retargeting.