A plus is a simplified space encoding (used if% 20 is not used, although both values ββare the same). "-" has no special meaning in URL encoding and will be decoded as "-", where "+" will be decoded into space.
Sites such as stack overflows must translate spaces into '-' to create a URL (as opposed to encoding a URL).
See the wikipedia article on URL Encoding for details .
Oh, and to directly answer the question, neither better nor worse for SEO.
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