PRP centrifuge and PRP quality: Differences in type or brand of centrifuge, quality of the PRP produced and effectiveness?

During my research on PRP therapy I have come across different brands / types of centrifuge machines and their have been mention that some are more superior then others. Better quality PRP produced, more growth factors, more stem cells and just a better quality more effective PRP. Is this in fact the case? What's the differences between different centrifuge? Also the differences in the PRP they produce? Do some produce a more effective PRP for hairloss therapy? Thank You!