Bow arm.
As a teacher, I am more concerned with set up from the bow arm. I have students that stand face the bass. The bridge should touch their second knuckles on their bow hand. I don't want them reaching down too much as this causes shoulder problems. I don't worry too much about the eyebrow as long as the bow hand is taken care of. (It usually works out about the same way...)
Sitting is a different pin height, and varies greatly from player to player. Body type, arm length, etc... Even then, I get the bow in the proper place comfortably and the left hand will be just about where it needs to be.
The bow is the true art of playing classically. I focus on it first.
BG
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