FIOS is a copyrighted term that is used by Verizon to advertise their fiber-optic line. It doesn't really mean anything. The fact is that in 99.99% of the cases, your house does not have fiber-optic lines running through it nor do you have a fiber-optic router nor a fiber-optic network card. The trunk (the main line) outside your home may be fiber-optic but inside it is straight copper. Normally, an ISP (internet service provider) will limit your speed based on how much you pay. If you are a business paying $1,000 a month for internet access, I guarantee you it will be AMAZINGLY fast. Thus, the speed is based on how much you are willing to pay them not on some fancy name.
FiOS Quantum is a product of Verizon and therefore, there is no competition. However, it is also one of the fastest internet service provider offering highly variable download speeds. You can check out http://www22.verizon.com/home/fios-fastest-internet/ for more on its services.