Both will work I suspect about the same.
Ethernet cable can go 100 meters and run gig speed with no loss. Even if you were say to run
modem --100m ethernet --- router -- 100m ethernet --- pc
you would get no loss and gig speed (assuming your equipment can do gig).
The coax cable is slightly different. You are increasing the distance to the ISP. The exact distance limitations depends on many factors but will adding 50ft of cable matter... most likely not. You would have to be at the very limits.
Unlike wireless wired cable that is within the specified distance has 0 loss. If you attempt to go over the distance most the time you get a 100 percent loss.
I have a very short coaxial cable (ISP line from the street) connected to my modem. I connect my router (Airport Extreme) to the modem and my Directv box to my router (Airport Extreme). All three of these (router, Directv, and ISP coaxial cable) are in the same room, on the north side of my house.
I live in an old building and I have an Airport Express extending my network, but its not always a very strong signal downstairs, in the south side of my house.
I need to set my network up so that I have a better signal in the south part of my home.
Which would cause less signal loss?:
1. a longer ethernet cable connecting my modem to my router and another longer ethernet cable connecting my directv to my router.
2. Creating a longer coaxial cable by using a F to F adapter and keeping the ethernet connection from my modem to my router the same distance. (Basically, I would move the modem to the kitchen (on the south side of my house.) I would then use a longer ethernet cable to connect my modem to my directv box (which would remain in the north part of my house).
Basically, I am asking which cable (coaxial or ethernet) would maintain the best signal?
Thanks to anyone who can help!!