Ok, I’m clearly out numbered on this one, so please explain the advantage of the pressure vs vacuum because this novice just can’t see it.

Here is why I used vacuum: With vacuum you can top off the reservoir without stopping. The air bubbles are much larger, therefore easier to remove. One size fits all, no caps to buy. Very cheap and easy to make. Can change fluid w/o leaking a drop.

My abs car is about due for a fluid swap, so let me know if I'm gunna ruin it.
Thanks