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In _theory_, theme to theme (that is, for example, an asian page linked to an asian page) is the stronger...
In practice, it's hard to tell.
In theory, google, as an example SE, in "downgrading" index-to-index trades.
In practice, it's very hard to point to any evidence that is actually true.
Your best bet is to mix it up and try to set up some of both.
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