The lower the better from a bike handling perspective as long as you don't try to pedal through a tight corner. There is also more bike between you and ground versus being perched up high like witht the original Cervelo aluminium P3 that had a high BB relative to ground so you could get lower at at the front end without a really short head tube. We had a discussion a while ago if being in the same position high up in the air, or the same position low in the air but with more bike between the legs was more or less aero. I don't remember the consensus on how having more bike between legs or less bike between legs helped or hurt laminar airflow. Originally I thought lower to the ground (thus lower BB) would be better based on downhill skiing dynamics, but there is no bike involved going through the air in that sport, its just a human in a tuck.

I personally like low BB bikes as I have no need to pedal hard out of corners (not racing crits or road)

// the bb is the reference point for stack & reach .. so the fit itself fits .. clearance to the ground / while pedaling / depends also from tire size and crank length .. in general more bb drop leads to a more stable handling [all other geo & balance factors unchanged] ..

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