Xfinity works great, just make sure to purchase an adaquate speed. 99% of issues people have with ISPs is their own fucking fault, I.e. why do I have lag with 15 devices all streaming Netflix on the cheapest per month plan.

I pay $79.99 for 1 gig down (get 1400 Mbps or 1.4Gbps), 40 Mbps up. I recommend your own router and modem, the Xfinity ones tend to be a bit garbage wifi wise, they work fine for Ethernet though.