Back to the original question.
The answer is that:
1. Undoubtably, you will pay more to learn to fly at Norwich, it's a commercial establishment which has to be commercially viable, I don't agree with the previous attitude of the airport management to G/A but things are changing and hopefully for the better. There are four flying training organisations on the airfield, all offer a very high standard of training and if you learn to fly at Norwich you will get the regular flying experience which will equip you to fly anywhere in the UK without any worries.
2. You could learn to fly elsewhere and there's nothing wrong with doing so at Old Buck, or Seething. Those who have put down Seething forget that, although the way they do things is slightly different, they do have access to some very experienced instructors a couple of them are current very senior captains with major UK airlines. The CFI at Old Buck' is a very good instructor and comes highly recommended, but ultimately neither he or the other instructors don't have anything to beat that those at Norwich or Seething do.
Beccles now have the parachute people to contend with and, as they probably bring more wonga to the place your flying activity could be restricted by their operations.
3. Its entirely up to you where you opt for, but whilst more expensive, learning to fly from a properly equipped regional airport gives you the experience to cope with almost anything.