I don't think there is a way you can quantify which is better. Hardware wise, I've seen many instances of people I know using Acer laptops for more than 3 or 5 years and still working. But there are also those that experience otherwise. The story is the same for Asus.
Between this 2 brands, my take is just go with whichever that meets your requirement and budget. Go and try it out physically before deciding.