AT&T Fiber 2 Gbps wins for users requiring symmetric bandwidth, delivering full 2 Gbps up and down with lower latency per independent tests from PCMag and Ookla. Xfinity 2 Gbps DOCSIS 4.0 provides broader availability and easier self-install but caps uploads at 200 Mbps, trailing on upload-heavy tasks. AT&T scores higher overall due to consistent real-world performance metrics from multiple rev...