I When to use Feynman or Schwinger Parametrization

[Elmo]

TL;DR Summary

A question about loop calculations by Feynman and Schwinger parameterization

I had been doing some calculations involving propagators with both a quadratic and a linear power of loop momentum in the denominator. In the context of HQET and QCD with strategy of regions.
The texts which I am following sometimes tend to straightaway use Schwinger and I am just wondering if there are any restrictions/conditions in the use of each of these techniques.

 

[vanhees71]

Hm, I'm more used to the Feynman parametrization. I don't think that it makes much of a difference which one you use.