modem recommendation, and a related set-up/wifi question

I am looking to replace my Cisco DPC3825 gateway with a standalone unit. I have the preferred tier and am looking at the arris sb6183 and the netgear cm500. Can anyone recommend which one they've had good luck with? I'm also thinking of getting a wifi mesh network (eero) and was wondering about the setup. if I set it up with my current wifi network credentials (ssid, password), will my current devices connect to it automatically? or will I have to reconfigure each device again? anyone have experience with this? Also, with the mesh wifi, if/when I lose internet will the whole network/devices go down? The current Cisco is a modem/router combo and every time I lose internet connectivity, my wifi security cams all drop "offline". wil having a separate wifi network from the modem keep the cameras on/viewable? Thanks for any tips. I'm just trying to do some research before replacing equipment and tackling a setup process.