I am considering buying a new dive computer.
I know you specifically asked about two different Cressi computers. But, I really need to add my opinion that you really cannot do better than a Shearwater. I learned to dive using a gauge and tables in 1981. I bought my first computer in 1990 and owned several over the years such as Aladins and Dive Rites. As a dive pro, I've had to help people figure out their dive computers for a quarter century. When I became involved with DIR diving, I went back to just a gauge/timer with computer generated tables and ratio deco. Then, I was given a Shearwater for my birthday.
THE SHEARWATER IS A GAME CHANGER!
I have the Perdix (also has an air integrated model) and Petrel 2. Both do Air, Nitrox, Trimix, Rec, Tech, Cave mode. Amazing features including downloadable logs, custom screens, personal displays, two compasses, tissue graph, every detail you want to know, gradient factors, bubble model upgrade, Wow!
Just sent my Perdix back for a bad depth sensor that's covered under warranty. Diving my Petrel 2. Can't say enough for the performance and customer support.
I apologize for not answering the question asked, but the Shearwaters are such amazing computers that anyone thinking of getting a new computer should look into them before buiying something else. They have just released the new Teric. Rec, Tech, Freediving, Air Integrated, & Watch.