They're about the same. They all have terrible customer service, shoddy install people, and heinous wait times for installation.

But their internet rarely goes down. I've used all 3 for at least a year each. Comcast has certainly come a long way. xfinity is overpriced and the On Demand UI constantly crashes. The FIOS UI is slow and combersome. Haven't used Cox in a few years.

Either way I could fly down to Brazil, grab some monkeys from the rainforest, and train them to support customers better than any of those three.