Verizon FIOS leaves the competition way behind in its FTTP (Fiber To The Premise) technology, a rock-solid, 5-9s telco reliability, technology. At our place, we have two 2.4Gbps FIOS ONTs (Optical Network Terminals). (A business circuit and a residential circuit.)
Unlike return channel radio (i.e. cable), FIOS doesn't have issue with weather, nor congestion, nor does Verizon do traffic shaping (something Comcast has gotten in trouble for doing). FIOS also has highly trained folks way above folks like the cable company, and the FIOS install is superb.
If FIOS is offered in your area, it's the hands-down winner for speed, reliability and customer service. It runs CIRCLES around cable and is very much more reliable.
DSL, and FTTC (offered by ATT's U-VERSE) runs on tiny wires using 60 year old facilities in many cases. They are problematic, at best, and if you're downloading something you may, or may not, be able to get a HDTV signal. The wire is simply too small, is subject to EMF (interference) and has problems when it gets wet or struck by lightning. DSL is a better than cable, and U-verse may, or may not, be as good as DSL depending on how the system is managed in the area you are in, distance, and other factors with ATT which has HORRIBLE customer service.
Cable modems use a return channel in the CB band that is susceptible to interference (a curse on the technology), and cable has frequent outages with splicing and weather, as well as sub-standard customer service. Lots of times, the person on the other end of the phone with the cable company is a certifiable idiot.
In the picture above the ONTS are on the bottom. The fiber looks like a black string, and comes out the bottom. The units on top, on each side, are the battery packs for emergency power. Note that the Verizon install has stuff fastened to the wall, and looking nice. Our business circuit is on the right, and our residential circuit is on the left.
Most times, Verizon will offer a free install, and / or, a discounted rate.
We monitor our FIOS every 15 seconds, 24 hours a day. It's been down 1 time in 4 years for about 4 hours, and 2 other times for LESS than 15 seconds...EVER. It's that good.