WZYT vs SNT for vomiting

Dear all (Laurie), Smile

Wuzhuyu Tang and Sini Tang are both very different formulas, yet they both treat Shaoyin vomiting.  (Lines 309 vs 324)  Both pictures are of Shaoyin sickness, cold limbs, retching due to cold and possibly dampness in the middle.  There seems to be more of an emphasis on SNT for diarrhea (esp clear-food) and more of an emphasis on Wuzhuyu for reflux and heart-shen disturbance.  Both approaches treat pain and vomiting, so my question is, what are the main differentiating factors in deciding between these two approaches to Shaoyin vomiting?

Thanks in advance,

Tim