Ethernet cable for TV

High end Sony and LG both limit ethernet speed to 100 Mbps. 

Strong wifi might be a better option. Sony uses wifi 6 and the LG wifi 6E in the G series, so the LG is better with speeds up to 700 Mbps.  I have a G with Eero 7 mesh and it never buffers.  

Or you can use a USB to Gigabit Ethernet adaptor to by pass the 100Mbps port. 

Sorry, no advice on cables.

Want to know what makes a bigger difference than changing cables?  Using an old OC as a pfSense server or rather an old PC that acts as a router.  I used an old i7 4770 with a dual 1Gb card, and it was a huge difference compared to my flashed R7 using ddwrt.  It never reaches over 1% CPU usage performing regular router duties.  Thus the fan never needs to speed up unless its getting clogged up, which takes something like 6 months or more at 24/7 usage.

As someone who works regularly with networking cable, I will say good cables make a difference. The number of time I've been trouble-shooting a device at work and tried a different ethernet cable (i.e. one that didn't come with the device) that solved the problem is legion. I use cat 6a at home. All my computers are connected by ethernet cables to a router or a switch. I use my TV as a monitor connected to a Mac Mini which has a 10G port. I can either watch movies from my NAS or over the web. I don't want the crap in the TV running the show. But I only sub to one channel so I'm not a streaming TV guy in general.