Benefits for your website:
Authority in Google
PR8 trust from an authority site
PageRank boost (takes years though)
Boost in rankings
Traffic from the post which can convert to customers
I will promote your content on Reddit in order to drive traffic from there.
The traffic coming from Reddit on your website is real.
Most of the Reddit traffic is from United States and Europe which is good for your revenue.
Subreddit will be on your choice. I can also suggest the suitable subreddit for your link.
Medium.com is a top blog in the United States. It is a high authority social website with incredibly high Domain Authority, Trust. One guest post on this website with a back link to your site will dramatically increase your page ranking, and change the picture of your business.