TLDR:The Langham, Gold Coast is my first pick for a luxury beach stay. For a family pool trip, try JW Marriott. Need space and a kitchen? Look at Hilton's residences. For a resort away from the beach strip, try InterContinental Sanctuary Cove. Compare the exact room and total price for your dates.
TLDR: Choose Broadbeach for beach days, a relaxed dinner scene and a handy base for couples or families. Choose Surfers Paradise for clubs, bars and sights. Both put you near the sand, and the tram makes it easy to visit the other.
TLDR: Choose Dreamworld for a mixed-age group that wants rides and wildlife in one day. Choose Movie World if DC Rivals, film characters and shows are the main reason for your trip. Check ride closures before you buy: the better park is the one with your must-do rides open.
TLDR: Choose the Gold Coast for theme parks, nightlife and a beach base you can enjoy without a car. Choose the Sunshine Coast for a slower trip built around beach towns, coastal walks and the hinterland. For a short first visit with a mixed group, I would pick the Gold Coast.