They're both full of shit. The difference is Mouratoglu has results behind him, what did Tiriac even do? Oh right he won a slam, oh wait, it was in doubles.
He's a nobody that nobody even knows outside of Romania, and he's desperately clinging onto the career of Simona for a shred of relevance now that the last years of his life are approaching him faster and faster.
Do you realise that he brings 100 million euro profit every year to Madrid, one of the richest cities and capitals in Europe? Ion Tiriac is International Tennis Hall of Famer, inducted in 2013. He's one of the most known businessmen on the continent. Played 3 Davis Cup finals against United States, for your knowledges. Managed, coached or adviced one of the greatest players in tennis, from Villas, to Leconte or Becker, then Ivanisevic, Mary Joe Fernandez and Safin.
If you think his contribution to the sport wasn't major? - excellent tennis player; - coach; - advisor; -tennis manager; tennis investor (held tournaments in Germany, Romania, Spain etc) Ion is the guy who ran the ATP Finals in Hannover in the 90s, currently relocated to London
I can name a few of his best friends: Wolfgang Porsche, Georges Marsan, Rudolf Streicher, Iñigo Herrera Martínez de Campos, Stefano Ricci, Franz Josef Rauch, Erich Hampel, Siegfried Wolf, Mark Miles, Boris Becker, Klaus Mangold, Alfred Baumhauer of Cartier Jewels etc.
Ion > French "Mourat"
Who did launch Mouratoglu to the highest level? He has only trained 2nd tier player, beside Serena Williams. He made a name on her back.