I like that 11 to 13 run as you get a 3, a 5 and a 4. But they are all running in the same direction.
6 to 8 gives you a nice variety of very different par 4's.
I also really like the 16 to 18 close, as well as 2 to 4 or 3 to 5.
My answer is that this isn't really a simple question.
Sven