[OTW] Grep vs SED

(Off the Wall Question) I have been asked:

Given a very large file.txt and a desire to remove a matching line:

	$ grep -v matching_line file.txt > file.txt.new

or;

	$ sed '/matching_line _RegEx/d'  file.txt > file.txt.new

Which method is more efficient or is it a tossup?

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