My own experience is as follows. Apple far and away the best. Hotels.com pretty good, although if taking reward nights the earning rate is unclear, and you do wait until checkout +90 days for the Avios. Dell and Microsoft have both had reversals, the Dell one around a year after award. Persistent emailing and follow up had them both reinstated. Hilton, PC World, both very unreliable, I’d say avoid as you’ll most likely end up frustrated.
John Lewis been good too, and off topic but Waitrose is an easy earn for Virgin miles if you shop there.