The SO has 36T ratchet and the PI has 32T. However, the Snap-on has a superior flex joint for the head. It moves easily and a more sensible amount (more than twice as far). For some strange reason the PI pivot is very stiff and the range of movement is only very slight. The TechAngle has more flex again.
https://www.amazon.com/Precision-Instruments-PREC3FR250F-Silver-Torque/dp/B002XMSFIM