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The Reddit search is very static. It only gives you exact term matches from the title and body of a post (mostly). The advantage is that all reddit posts are instantly indexed (findable).
The google search doesn't only search in the title and body, but also in the comments. It also finds synonyms and potentially even finds a post through link structures.
Other search engines can do this too, for RepArchive we've done this 1000s of times, but (sadly) we have to make the clear conclusion that Google has the best indexing and does a lot more crawling in our specific niche.