Noindex Pages Can’t Accumulate PageRank
Noindex pages can’t accumulate pagerank for the site, even though the pages can be crawled. So this isn’t an advantage over disallowing.
Unwanted Sitelinks Pages Can Be Nonidexed
Sitelinks which do not disappear after being demoted, can be removed by adding a noindex. If the Sitelinks are showing incorrect international pages, hreflang tags can be used to identify the preferred version.