Goals Concedeed by each top 8 teams in the Conference games

Sometimes i wonder what is the hardest conference at the moment and what will be in the future.
One of the factors that could help deciding it, its the number of goals concedeed by the top 8. Of course that if it is a regular and experient manager will conceed less goals. Lets see what is the conference that conceeds less goals:

1. Conference 5 .... 43 Goals
2. Conference 4..... 44 Goals
3. Conference 8......46 Goals
4. Conference 2..... 50 Goals
5. Conference 7..... 63 Goals
6. Conference 1..... 65 Goals
7. Conference 3..... 66 Goals
8. Conference 6..... 119 Goals

As you can see, this is close... but this is just one of the things that could point what is the hardest one. Looking forward for the future to see how the things will be.