80 / 20 or 20 / 80

I've been taking a financial course all day. I now have a head full of numbers.

This is resulting in putting the previous post into numbers:

Items 1 and 2 comprise of the "20%".
Items 3 to 13 comprise of the "80%".
This is the 80 / 20 path.

But we seem to more often flip this:

Items 1 and 2 comprise of the "80%".
Items 3 to 13 comprise of the "20%".
This is the 20 / 80 path.

And let me say from my very limited perspective and experience the 80 / 20 path seems like a wiser investment with more gains.