I do not know which of the heat breaks I am supposed to use and which is the best.
the one on the left is the has a small hole for the filament the one on the right has a plastic tube and is bigger is the white plastic tube supposed to be left inside is the one on the left better.
The one with the plastic liner is intended for a low temperature hot end. The all metal one is required for a high temperature hot end. I think you can choose high/high or high/low on the DSH, and use the corresponding parts.