I don't know if others are like this, but I NEED repetition AND novelty.
I'm very predictable day to day, and I like it that way. By sticking to the routine, I don't have to spend brain energy on basic things like What's for lunch today? (On Monday, it's tacos.)
That being said, my favorite of anything is the one I've never tried before, or haven't had in the longest time.
I don't really understand it, because it seems very contradictory to me. I LOVE novelty and variety, but at the same time, I find repetition and routine comforting, and I'll be mentally uncomfortable all day if the taco place happens to be closed on a Monday afternoon.