The switching infrastructure the modems connect to is different too where FibeTV is available. The switches have mulitcasting, QOS, and some other stuff that allows the TV to work optimally.
On FibeTV (VDSL2), copper runs from your house to the remote. The remote is connected to Bell's actual Fiber network. This is where the QOS stuff happens too. I believe the length of the copper between your house and the remote can't exceed 800M as well.
It's not terribly different where ADSL is available (Bell's older internet technology), but the exception is that with ADSL, you can be upwards of 6 - 10 Km away from the remote - but the further away you are, the speed drops. These remotes are also usually Fiber fed too now (not always though), and those other services I mentioned (multicasting, QOS) may not be enabled, and may not make a difference to have them enabled.
Panasonic TC32LX60 | Denon AVR890 | Klipsch RB-61 / RC-10 / RW-10D | Motorola VIP 1232 (Bell Fibe)