Ehernet cable question in streaming systems

I want to install a "better" ethernet cable  between my streamer and remote wireless Google pod (my stereo system is in the basement}.  My question is this:  Should I also get a better ethernet cable between my router and modem (up stairs in my office) at the same time?  My thinking is, when I  upgrade the cable to my streamer, shouldn't the cheap, Google supplied cable between the modem and hub router be replaced too?  Thanks, Jim