Only really three options in Dubai.
Falcon Aviation run the EC130s from Festival City. Not a bad operation and nice machinery.
Aerogulf Helicopters run a couple of machines on tours, 206B I think and a 206L. Great bunch of people.
Heli Dubai have some Agusta 109s and an AS350B3 and were the first ones to run tours in Dubai.
No matter which one you choose I think you will enjoy the flight.
Ned