Calvin Wells shows up on both docs.
And I know that Fyre was made by the Jerry Media guys, but I preferred it to Fyre Fraud because they were able to provide so much more insight as to everything that went wrong in more detail than Fyre Fraud did. Obviously, Fyre Fraud didn't have as much access to first hand accounts outside of Billy, but if I'm watching a documentary about the Fyre Festival I want to know as much about the Fyre Festival ordeal as possible. I think Fyre was able to cover that more. However, to their credit, Fyre Fraud made up for lack of festival details with more background on Billy and really leveraged paying him to get us more details on things like Magnises.
In all, I think watching both of them really gives you the fullest picture and makes for an awesome double-doc.