The general recommendation for home use is a CAT6 cable. It has enough speed to handle downloads and gaming. A home with an average internet connection will perform solidly with CAT6 or CAT6A. And, a very important point, CAT6 is cheaper than CAT 7.
However, if you’re running multiple applications, such as those needed by smart home technology, or using it in a business environment, you may get better results from a CAT7 or CAT7A cable because these can support multiple applications with fewer errors and less crosstalk.
Therefore, I think your friend’s suggestion is worthwhile to accepting.
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