Rather than ask which modem to buy, check out this review site. They do an excellent job and update their recommendations as new tech comes out. : r/Comcast
Amazon.com: ARRIS Surfboard S33 DOCSIS 3.1 Multi-Gigabit Cable Modem | Approved for Comcast Xfinity, Cox, Spectrum & More | 1 & 2.5 Gbps Ports | 2.5 Gbps Max Internet Speeds | 4 OFDM Channels | 2 Year Warranty : Electronics
The 3 Best Cable Modems of 2023 | Reviews by Wirecutter
How to Get the Best Cable Modem: Buy or Rent From Your ISP? | PCMag