Sub-domain vs Sub-page Question

Sub-domain vs Sub-page Question
While a sub domain is treated as a "separate" site, is there any weight is transferred from the main site. I have something that I want to add as a subdomain as it makes far more sense that way, but there is a need that the section I wish to add be indexed fairly fast. Therefore was thinking of maybe adding it as a sub page of the main site instead? Then release the subdomain version and delete sub-page once this short term need has passed?
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