Why choose an insertion over a new guest post?
The page already exists and Google already knows it. In some cases your link can be picked up the next time the page is crawled, instead of waiting for a new URL to be found. We put no time on that, because crawl timing is Google's call.
The trade is control. In a guest post you write the whole article. In a niche edit you control the link, the anchor and the target page. The host article sets the topic, the tone and the readers. Our comparison covers when each fits.
