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So I shouldn't have sitemaps submitted to both versions?   If I want to use HTTPS as my main version, should I delete the sitemap from the other?

Is there an advantage to keeping a site vs deleting it?

My website is https but the default property that was configured on Google WMT was http and wasn't showing me any information because of that.

I added an https property for that, but my question is: do I need to delete the original HTTP or can I leave both websites?