From my collection, a Southford hook and a HPC hook pick (both survivors from a grab bag commercial kit), a new Peterson Carbon Steel (Rubber Handle) and a "Wiper Blade" special as a baseline.

Weight
Southford - 8gm
HPC - 13gm
Peterson - 6gm
Wiper - 4gm
Thickness
Southford - .44mm
HPC - .65mm
Peterson - .58mm
Wiper .67mm
Height (At throat of hook)
Southford - 1.71mm
HPC - 1.52mm
Peterson - 1.15mm
Wiper - 1.54mm
Not surprisingly the Southford had a lot more flexibility due to the thin pick blade. I was really surprised that the wiper blade picks I've made had the same approximate dimensions as the HPC pick (Although lighter due to the more basic handle). The Peterson picks are super thin in comparison, and really easy to navigate in a Schlage keyway but seemed just as flexible/stiff as the HPC picks.
So far I've successfully used all four picks to open up a Schlage 5 pin practice cylinder in approximately similar times (I'd chart them, but I'm inconsistent enough that that wouldn't be super helpful). I definitely prefer the handle comfort on the Peterson picks (although I prefer the longer handle on the custom pick not surprisingly), but the feedback seems better on the metal bodied Southford and HPC picks. I'll add additional notes as I try all four picks on additional locks.