You can view ads grouped by their advertised title/website. To do this, go to MAX > Ad Review > Review > Campaigns in your MAX dashboard. You will see which advertisers are serving the most impressions and through which networks.
Click on the title of a campaign in this table to see more information about that specific campaign, such as the ad networks the advertiser uses, the countries it is targeting, how impressions have changed over time, and the creatives and videos that make up the campaign. This can help you get insight into a variety of campaign strategies.