For "wired" or "land" connections for most of Canada you have a choice between one of the two providers in your area (duopoly)--one historically "cable" and one historical "telephone" provider. In some cases only one exists. In most cases they all offer "triple play" (Internet, Voice and Video).
Cable guys, Rogers, Shaw, Cogeco, Videotron, Eastlink, and many other smaller ones.
Telephone guys, Bell, Telus, and many smaller ones.
There are corner cases but in general you only get one of each and not two cable or two telephone providers to one area. No switching from Rogers to Cogeco for example, unless you move.
The core technologies they use, different for different areas:
Cable: HFC with DOCSIS. RFoG with DOCSIS (FTTH) or EPON/GPON (FTTH) -- Phone is IP (MGCP or SIP), Video is legacy digital or IPTV.
Telephone: Copper with xDSL or GPON (FTTH) -- Phone is POTS or IP (SIP), Video is mostly IPTV (or sat).
Most people are only concerned with Internet these days.... Companies like Start, TekSavvy, etc. basically are TPIAs and run over top of the infrastructure above. If your Rogers access sucks due to plant problems the TPIA that uses Rogers will be exactly as sucky. They even have sub brands like Rogers has Fido and Bell has Virgin that are marketed like a TPIA.
In general, and I really know this.... For every person that say X sucks, there is a different person that says Y sucks. Different areas, different tech, different experiences. Old coax, new coaxs, old copper, new copper, new fibre....
Wireless/cellular has more options in most areas.