If you run home servers and like having complete control, I recommend staying away from AT&T Fiber. They play lots of network games (port remapping/takeover, routing issues, no limits but limits!).
Google Fiber, on the other hand, has been clean and clear.
I haven't had any trouble with AT&T fiber. My bandwidth has never been capped. I don't run public servers from my home, but I do have family who stream from a Plex server and it's never been an issue.
* 500/500 for $60, can go up 5gbps symmetrical if I wanted
* While not advertised as static, I've had the same IPv4 IP since I checked a year ago
* No significant downtime
* The provided router has a single 2.5gbps port and has 802.11ax
Disatisfied:
* The ONT and gateway is a Nokia BGW320 provided by AT&T that I must have. I cannot provide my own. There are some work-arounds with pfsense [1] and bridging 802.1X traffic.
* The Nokia ONT/Gateway kinda sucks and it's ARP tables fill up and the general networking of it are fairly basic and what you'd expect for some $30 TP-Link.
* I'm fairly confidant that AT&T uses CGNAT. I haven't been able to get Plex remote access to work correctly.
Google Fiber, on the other hand, has been clean and clear.