Just because a new page could logically fit on either site does not mean you should put it on both sites! If you do, then your problem is not the sandbox, but duplicate content.
If I were you I would take a very close look at both sites and make sure there is no overlap in content - make sure that each site is truly unique. It can be really easy to inadvertently use the same phrases, same structure, and if there is too much duplication Google will drop the newer of the pages.
As to where to put your new page, my suggestion is to think long-term and put it on the site where it fits better. Maybe it won't show up in searches immediately if you put it on site you presume is sandboxed – but the sandbox does not last forever. If it’s crucial that it get indexed now, then yeah, put it on the ranked site – but you may have to deal with moving the page later on.
|