Direction of fuse on P20

This is a quick one. I purchased a synergistic orange fuse and they say direction does matter. With the P20 fuse holder what side is hot. Is it the side of the fuse holder or the inside wall of the P20?

Here is the direction with the Purple Fuse I always find better.

Anyhow it is a try and error process. Try one direction and listen for a few days. Then flip the fuse and judge what you like more.