Because both Anthony Joshua and Andy Ruiz are in their respective primes, I think this is by far the more interesting match-up. Deontay Wilder as usual has chosen an opponent he knows he can beat, in this case because of Luiz Ortiz' advanced age.
Joshua vs Ruiz seems the obvious pick. Was a good fight and the turn around is quick enough that we know both fighters are still at or above previous form. Deontay vs Ortiz was also an exciting heavyweight fight but time has passed and people aren't clamoring for it like right after the fight. Also Ortiz has looked less impressive over his last few fights
Ruiz-AJ II will be a dull fight. Ortiz is better than both, AJ & Ruiz are just not appealing on the eyes (stylistically) I would never watch with friends. It's like a carnival match Ortiz is on his last legs, he's looking as Wily as ever. Wilder better not think he's going to steam roll Ortiz like he did to Henchman Breazele Ortiz would smash Ruiz & AJ
Ruiz-Joshua will have a massive effect on the division regardless of who wins, whereas if Wilder beats Ortiz again nothing really changes. I think both have the potential to be very good fights, but the former definitely more so.
Deontay Wilder always fights old men (Ortiz, Harrison, Owen Beck) people who were coming off long periods of inactivity (Fury) chinny journeymen (Szpilka) shot fighters (Arreola, Lyakhovich) old former super-middleweights (McCreary) or limited opponents (Gavern, Washington). He has always refused to fight better opposition (Joshua, Ruiz, Usyk, Parker, Kownacki, Fury when he was active before his nervous breakdown, Klitschko a few years ago, Takam and Pulev when they were younger and stronger, Ortiz when he was younger, etc).
Where's the unlike button for this load of old cobblers. Ortiz's best win is Bryant ****ing Jennings FSS, not Godzilla. The BabaYaga of the Heavyweight division is no longer and in fact, never was. He's a few years off getting his bus pass for crying out loud. Ortizn't is a gate keeper now, nothing more and his last few performances proved that. David Price did a better job on an in shape Dave Allen FFS If Wilder doesn't take care of him in 4 rounds, it's an embarrassment.