Really doesnt matter which you choose. Rugers are workhorses as are S&W. You shouldn't have a problem with either.
As for barrel length, if it was primarly a hunting weapon go with a 6" barrel. If its for plinking, carry, or occasional hunting I would go with the 4"as may have already stated.
What it boils down to is which feels better to you. Life is full of tough decisions and these are the fun ones.
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