Spectrum/Time Warner Modem

So I recently had to make the change to Spectrum. In doing so I will need to get a new modem and was wondering if any of you have some suggestions. I am getting 100 mbps download speed option and the choices I am thinking about are the Arris SB6141 which can go up to 100 mbps but only has 8 channels or the Arris SB6183 which can go up to 300 mbps and has 16 channels, but according to spectrum is incompatible with ipv6 on their network. So the question is how important is ipv4 vs ipv6 or 8 channels vs 16 channels? Anyone have experience with either of these modems or has another suggestion?

Thanks in advance,

Todd