If you redirect google won't pick this up in the way your thinking. If your existing site has low traffic but you have a better, keyword rich domain, do it the other way around.
Forward your existing domain to the keyword rich one and move your content over. There's not point in using the domain which isn't keyword rich and has low traffic really.
On the second point, yes hyphens in domains can still give you good rankings but domains will rank lower than without hyphens and can look spammy so try to avoid them if possible.
Mike
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