Is it better to write a guest post and link to your website, or simply buy a link in an existing post?

For example:

Option 1: 1000 word guard post and with 1 dofollow link. They also request $25.

Option 2: $40 and a link back to your website in an existing post that was written some time ago.

I have always chosen option 2 but i'm wondering if this negatively affects rankings.

submitted by /u/someone3245
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