Do you eat the same meals daily, or mix it up daily?

I am wondering, because it would make my life so much simpler to just make the same meals everyday, but I'm not sure if that's unhealthy. I just started working out, and going to school, plus working full time. If its the same daily, What are your go to meals? If you mix it up, do you plan ahead or just (Cauliflower)wing it?