FWIW FIOS and Uverse are not equal.
FiOS is hybrid bastard system that isnt 100% fiber.
Uverse on the other hand is 100% fiber from the street to the house and if wired correctly through out it.
This isn't entirely accurate.
FiOS is full fiber to the premises, after which the signal is converted to coax for the purposes of providing TV, and in older installs, Internet, after which it's converted from coax to ethernet. On newer installs this is skipped and the fiber is converted directly to ethernet. I believe coax system on older installs only went up to 75 ish Mbit, so they had to drop it when they started offering higher speeds. AFAIK, the TV side is still coax even on newer installs.
Uverse _can be_ 100% fiber to the premises, but historically they also used the Uverse marketing name to describe hybrid fiber/vDSL systems, which provided a single IP TV stream with 18 Mbit Internet.
To the OP's point, pure fiber to the home/premises (FTTH/FTTP) is technically preferred over hybrid systems, which is in turn preferred over legacy coax systems, as the fiber latency is generally lower and the system in general has more capacity. In reality however, the ISP's peering and maintenance is likely more important. Shaving 6 ms off the first hop isn't going to do much good if the traffic has to travel an extra 400 miles, cross through a congested peering point, or goes out when it rains because there's a garbage bag over one of the pedestals.