Switching is the same between all banks, it’s a standard across the industry.
I’ve had a quick gander and it looks much of a muchness
Now Santander have dropped their rates, it is, although you still get cashback on bill DDs. Nationwide still pay a reasonable rate up to £5k, and they have a good reputation for service.
FWIW, we have a Santander account as a savings/bills account, so we get interest on the balance and cashback on the DDs. It’s not a bad little earner to be fair. We also have a Co-Op Privilege Premier account, for cash spends and the packaged travel insurance and RAC cover.