Hi, Grand Hyatt Bali is much better than the Hyatt Regency Bali. Nicer property, nicer beach, more Restaurants etc. Grandy Hyatt offers excellent price/value.
But Bali has lots more of terrific Resorts, Ritz Carlton, Oberoi and -- of course and unbeatable -- the Aman Resorts. They are just perfect, very private, excellent service, food, individuality (and 500$+ per nite)