Everything said above is what I would say as well. They are quite comparable but the actual location is usually what sways someone to pick one over the other. If you want to be as close to town as possible, obviously the Royal PDC would win over Secrets. But Secrets is nice too. It's a toss up I guess!
But if you want my opinion....having been to all three - skip the first two and go to the Iberostar Grand. You SO won't regret it!
