Got 1 Backlink for free from a site: How to find out which URL is the best for?

Hello,

I got a free backlink from a good site which has similar content to mine.

BUT: How can I find out which URL from his site would have the best impact to my site if I set the backlink there? I can use any article (no start page).

What do you would do?

As a non-profi I would say I have to find out the url from the site which has the most backlinks. And then I can get the juice from it. Right? But how can I find that out without buying an expensive tool?

Thank you so much!

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