Anecdotal, but in my area (Central US-IL), we had Verizon as the telco many years ago and we had Verizon DSL (Comcast was the only other choice at the time). We had only 1 issue w/ Verizon and it was fixed quickly.

Frontier bought them out and they could not keep DSL working at all. Problem after problem that they couldn't fix. So we switched to Comcast - that's how bad Frontier was.

Now we use Metronet and I'm waiting for that to get completely enshitified since they were purchased by TMobile or someone like that. I hope i3 is available in our area, I'm guessing if it's not, they'll be moving in as Metronet goes to shit.