Powerful backlink comparison

Plz only answer experienced people:
Case1:
Site da 45+
-We made do_follow backlink in comments.
-Website has no niche relevency
-The page where we made backlink has 20+ good quality refering domains.

Case2:
Site da 70+
-do_follow contextual backlink in article.
-Website has no niche relevency
-The page where we have made backlink has no refering domains at all.

So my question is which backlink is more powerful?

Case two due to the fact of how powerful are contextual links