Thanks to all who posted - the information is very much appreciated.
I’ve decided to go the separates route and purchase both units.
UPDATE...
I purchased separates:
Netgear CM500 Cable Modem
Linksys 1200+ Dual-Band Router
With my TWC Internet plan of 15 MBPS, the speed is blazingly fast & consistently tests to 18 MBPS. ALL video streaming has zero buffering.
Thanks to all who posted and gave me a primer in this technology and allowed me to get the best bang for the buck.
Viva Donald Trump!!!