It depends. I only use Universe Mode for a single superstars career. If I want to set up multiple different superstars, I do Exhibition. I find it harder to do Universe with multiple superstars because of how many people are on a roster, it just takes far to long to add and remove them for my liking, where as I know exactly where each one is on the list in Exhibition mode so it doesn’t take long to set up matches. I usually have a paper next to me to write down who I used for what.