What distinguishes the progenitor cloud size for an open cluster compared to one forming a globular cluster?

Answer

The process that births an open cluster is inherently less massive and more localized

The initial cloud segment causing an open cluster is inherently less massive and more localized than the mechanism that births the million-star populations of globular clusters.

What distinguishes the progenitor cloud size for an open cluster compared to one forming a globular cluster?
galaxiesastronomystar formationopen clusters