Dynamic Search Ads would be most helpful for

Dynamic Search Ads are the simplest way to find the customers searching on Google for indubitably what you offer. This is an ideal way for with a well-developed website or with a large inventory. Businesses with websites that contain a lot of content or well-structured URLs will see the best results from using Dynamic Search Ads. 

Even well managed Adwords account with many keywords can miss relevant searches, experiance delays in getting ads added for new products or it may be out of Sync with what the website originally have.

How to Target : 

You can target 

• All the web pages  (or)

• Specific webpages containing certain keywords.

Benefits of Dynamic Search Ads :

• Save time. No more mapping keywords, bids, and ad text to each product on your website. Plus, Dynamic Search Ads may help you advertise to new markets faster than other alternatives.

• Frequent, automatic updates to your ads. When you make changes to pages in our index, we'll crawl your website again to help ensure that your ads are as up to date as possible.

• Show relevant, dynamically generated headlines with your ads. When a customer's search is relevant to your product or service, AdWords will dynamically generate an ad with a clear headline for the most relevant page on your site.