What is the difference of this two queries?

https://en.wikipedia.org/wiki/Car?action=raw

https://en.wikipedia.org/w/index.php?title=Car&action=raw

(i used first one before, then use second, but sometimes it's not response...)

are any of these queries doing extra processing on server side ?

which one i should use for more speed on my wikibot? (or any different query suggestion?)

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