Both of them are well known MMA fighters active until recently in UFC, one of the best known MMA organizations, so it will be interesting fight to watch.
Andreson Silva is 46 years with 34-11-0 MMA record, and Tito Ortiz is also 46 years old with record 21-12-1.
https://twitter.com/espnmma/status/1425542314773069824
If this is an MMA fight Ortiz could have been the heavy favorite but it turns out a boxing match so I go for Silva because of his split decision wins against Chavez JR and his boxing experience although he only had 2 fights enough to prove to the boxing world that he has what it takes to box and beat ranked boxers, I haven't seen Ortiz fought in boxing I have doubt if he can make an easy shift from MMA to boxing.