You can’t order Yayzi thankfully, they are still on a stop sell with CF, though ironically since the last migration, it’s actually been boringly reliable/fast. I would hard swerve Olilo as it’s one of the former directors of Yayzi (Liam) and NuFiber as that’s the other one (Martin), neither are people I would want to support personally as the only thing they were remotely good at is apologising for failures that more often than not shouldn’t have happened, let alone repeated.
If you want quality, Aquiss (another Martin) would be my suggestion, Vodafone really aren’t great - load balancing traffic between Edinburgh and London illogically, average hardware and poor CS, TalkTalk CF connections used to be handled by TT Business before the split and they were great, after the buy out I think they retained that part of the contract to provide management for CF connections on TT, but haven’t checked. Zen/IDNet use the same network and are not awful, but Zen of today is not Zen of old.
Sky get a mention now, they are DHCP based, but have been quietly monitoring certain activities on its network for years to guide it’s enforcement/blocking applications/policy as referenced in court records previously, oddly they have a history of standing up for customers when 3rd party rights holders try to use enforcement as a money grabbing exercise which was commendable, I believe they still stipulate you can’t connect your own equipment and need to use the hub, but it it’s never been enforced unless you have a fault.
Avoid anyone that uses CGNAT, it will cause you pain if you game or need to run services without putting in workarounds that add complexity.