In my neighborhood, I have one effective ISP, that is the cable company (who offers phone+internet+cable), the other is an old-school phone company who offers DSL (with bonded DSL, up to 12mbit). I thought that I could get a slow DSL connection to back up my cable, but no, there's some neighborhood line concentrator that means I can't get DSL at any speed.
So I really have only one ISP to "choose" from. (well, in theory I could get Starlink, but my area is still waitlisted, as is Verizon 5G home internet)