kapusta-
Fios will require a Verizon technician to come down to your house and install equipment outside (so I read).
Cable also requires installation, including drilling thru an outside wall or windowframe, then running an exposed ugly cable thru your house, including thru walls.
DSL uses existing interior and exterior wiring, but requires filters between ann non-DSL appliances (phone, fax, alarm) and the phone line.