Already indexes Wordpress search result pages: should I block them via robots.txt or just put noindex,follow?

Search result pages have been indexed by Google. I can see in GSC that Google is trying to crawl these pages:

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/?s=something /search/something/ /search/something/page/2/ 

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What is the best approach from the current situation?

Should I block them via robots.txt?

User-agent: * Allow: / Disallow: /?s= Disallow: /page/*/?s= Disallow: /search/ 

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Or should I put

<meta name="robots" content="noindex,follow" /> 

on those pages?

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My goal is to stop wasting crawling budget on those pages.

submitted by /u/chariozip
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from Search Engine Optimization: The Latest SEO News https://www.reddit.com/r/SEO/comments/g6jxdq/already_indexes_wordpress_search_result_pages/>