Mac OS Mojave and Mac OS Catalina has some differences that one can get. The fact that the difference between the two Mac OS, you can use one in place of the other. You can install either Catalina or Mojave is you had one initially because of that. The best things about Mojave is that you can have the support for the older Mac pro models. The only challenge that you have in Catalina is that you cannot support older Mac pro models with the use of metal cables. Catalina Mac OS cannot support 32 bit hence when you have a software that has 32 bit structure cannot work after you upgrade. One need to know that Mojave was the previous Mac OS that had 32 bit structure hence developers were told to upgrade on their software. The greatness of Catalina is in the fact that it uses 64 bits. Despite the fact that 32 bit processor is obsolete, you need to consider taking an app that has a 32 bit processor to the next level.
Update to 64 bit processor is the best thing that you can do since your performance increases and your RAM can be up to 4GB as opposed to 32bit processor. There are some things that you need to consider first before you move to Catalina. Confirming if the Mac OS has a 32 bit application is the first thing that you need to put into consideration. The best thing that you can do is to let the past be the past. If there is an application that has a 32 bit structure you wat to use them, you can look for any available upgrade.
One of the ways that you can clean you Mac pro when you get the best upgrades is uninstalling of 32 bit apps. There is no difference between other past Mac OS with Mojave since all of them keep medias in iTunes. In Catalina, iTunes is divided into three different apps for some simple reasons. One of the main reason that you get to have three iTunes is that it carries a lot than one application can handle. Your media get to move automatically to their respective iTunes when you upgrade.
With the use of Mojave, you get to have a better works flow due to the availability of dark mode that adjusts the display of the desktop. With the help of stacks, you can have a better file management system in Mojave. Due to the expand of the workspace, you get to have the best experience with Catalina than in Mojave since you have a healthy Mac life balance.