301 Redirection or links?

Hello guys,

I have two websites with similar content and subject but with obolete product, and a fresh one with good product and content. I was wondering : should I 301 the two old websites to my new one or should i just link them? they have 25 and 31 DA.

If i choose to redirect them : i have an issue : the new one has 2 langages (spanish and english) whereas one of the old website has spanish, english and chinese. Should I 301 the chinese version too ? will google understand that this is relevant?

Thanks

I would be giving warnings for this question.

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