Having been to both I’d choose Harrogate. And I hate Harrogate. Not uprooting to a new country? Tick. Title contenders and Champion’s league or relegation battle. Tick.
Been to Italy many times and love it but never to Naples and it was on my list until two friends came back from a 3 week driving tour around the whole country last week. They said the one place they hated was Naples, filthy from about 10K in to the centre. They were booked to stay for two nights but left after the first one.