geomOr vs. geomCat

Hi there,

We have to maintain some drc code and noticed that there is used geomCat() when logically geomOr() will make sense.
Reading the the documentation we understood that geomCat() is almost the same as geomOr(), except that teh shapes are not merged and the net/shape ids are preserved.

I guess that the previous implementer was using geomCat() instead of geomOr(), because I assume geomCat() is faster. Could be that the reason?

Any idea in which case geomCat() makes more sense than geomOr()?

Thank you,

Marcel