You can have your cake and eat it too — a personal site AND Medium. You just have to do it “safely” so that the Google Bots don’t penalize you.
The cool thing about Medium is that not only do they let you “syndicate” content, but they actually make it easy for you as well. Here’s a quick guide:
How to Syndicate Content Safely on Medium
It's now OK to syndicate content from your blog to Medium. The folks at Medium have made this process very easy, with no…
You absolutely want to maintain your own content on your own domain. As great as Medium is, what if it closes up shop someday? Your presence and your audience will disappear way faster than you earned them. It’s worth the “extra” effort to maintain control over your work, now and in the future.