Best Long-Lasting Nail Polish Brands & Science Fair Experiment

Question
What nailpolish brand lasts the longest without chipping and how would you test that for a science fair?

Answer
I would use subjects that had the same length and type of nails. Polish them with 2 coats of polish and have them perform various tasks such as filing, typing, washing or cleaning. All of these tasks chip polish.Different brands test differently I prefer China Glaze but I use Poshe topcoat on any polish and it holds extremely well. Can you give me a better idea of what you have done or are thinking about so I can better advise??
Thanks
amber